Propanoic acid, 2-methyl-, 3-methylbutyl ester

Formula: C₉H₁₈O₂
Molecular weight: 158.2380
IUPAC Standard InChI: InChI=1S/C9H18O2/c1-7(2)5-6-11-9(10)8(3)4/h7-8H,5-6H2,1-4H3
IUPAC Standard InChIKey: VFTGLSWXJMRZNB-UHFFFAOYSA-N
CAS Registry Number: 2050-01-3
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript.
Other names: Isobutyric acid, isopentyl ester; iso-Amyl iso-butyrate; 3-Methylbutyl 2-methylpropanoate; 3-Methylbutyl isobutyrate; Isoamyl isobutanoate; Isopentyl isobutanoate; Isoamyl 2-methylpropanoate; Isopentyl alcohol, isobutyrate; 3-Methyl-1-butyl isobutyrate; Isopentyl isobutyrate; Isopentyl 2-methylpropanoate
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Other data available:
- Mass spectrum (electron ionization)
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NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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Phase change data

Go To: Top, Gas Chromatography, References, Notes

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Quantity	Value	Units	Method	Reference	Comment
T_boil	442.95	K	N/A	Lecat, 1943	Uncertainty assigned by TRC = 0.3 K; TRC
T_boil	442.1	K	N/A	Lecat, 1927	Uncertainty assigned by TRC = 0.5 K; TRC

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
47.4	302.	A	Stephenson and Malanowski, 1987	Based on data from 287. to 442. K. See also Stull, 1947.; AC

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)

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Temperature (K)	A	B	C	Reference	Comment
287.9 to 442.0	4.6188	1848.636	-41.246	Stull, 1947	Coefficents calculated by NIST from author's data.

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Gas Chromatography

Go To: Top, Phase change data, References, Notes

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Kovats' RI, non-polar column, isothermal

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Column type	Active phase	Temperature (C)	I	Reference	Comment
Packed	SE-30	150.	994.	Ashes and Haken, 1974	Celaton (62-72 mesh); Column length: 3.7 m
Packed	OV-1	150.	998.	Ashes and Haken, 1971
Packed	SE-30	150.	998.	Germaine and Haken, 1969	Celite 560; Column length: 3.7 m

Kovats' RI, non-polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	BP-1	1000.	Srivastava, Ahmad, et al., 2003	25. m/0.55 mm/0.25 μm, N2, 5. K/min, 220. C @ 15. min; T_start: 60. C

Kovats' RI, non-polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	SE-30	994.	Chretien and Dubois, 1978	Program: not specified

Kovats' RI, polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	Carbowax 20M	1190.	Tressl, Friese, et al., 1978	He, 2. K/min; Column length: 50. m; Column diameter: 0.28 mm; T_start: 70. C; T_end: 190. C

Van Den Dool and Kratz RI, non-polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	DB-1	996.	Omidbaigi, Sefidkon, et al., 2004	60. m/0.25 mm/0.25 μm, He, 40. C @ 5. min, 4. K/min; T_end: 280. C
Capillary	DB-5	1020.	Moio and Addeo, 1998	30. m/0.32 mm/1. μm, H2, 3. K/min; T_start: 40. C; T_end: 210. C
Capillary	DB-5	1021.	Moio and Addeo, 1998	30. m/0.32 mm/1. μm, H2, 3. K/min; T_start: 40. C; T_end: 210. C

Van Den Dool and Kratz RI, non-polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	HP-5MS	1013.4	Andriamaharavo, 2014	30. m/0.25 mm/0.25 μm, He; Program: 60C (1 min) => 5 C/min => 210C => 10 C/min => 280C (15 min)
Capillary	DB-1	996.	Eri, Khoo, et al., 2000	60. m/0.25 mm/0.25 μm, He; Program: -20C (5min) => 10C/min => 100C => 4C/min => 200C => 10C/min => 280C

Van Den Dool and Kratz RI, polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	Stabilwax	1214.	Fang and Qian, 2005	30. m/0.32 mm/1. μm, N2, 40. C @ 2. min, 4. K/min, 230. C @ 10. min

Van Den Dool and Kratz RI, polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	Supelcowax-10	1187.	Bianchi, Careri, et al., 2007	30. m/0.25 mm/0.25 μm, He; Program: 35C(8min) => 4C/min => 60C => 6C/min => 160C => 20C/min => 200C(1min)
Capillary	Supelcowax-10	1195.	Bianchi, Careri, et al., 2007	30. m/0.25 mm/0.25 μm, He; Program: 40C(1min) => 10C/min => 120C => 15C/min => 200C (1min)

Normal alkane RI, non-polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	VF-5 MS	1014.	Leffingwell and Alford, 2011	60. m/0.32 mm/0.25 μm, Helium, 2. K/min, 260. C @ 28. min; T_start: 30. C
Capillary	VF-5 MS	1015.	Leffingwell and Alford, 2011	60. m/0.32 mm/0.25 μm, Helium, 2. K/min, 260. C @ 28. min; T_start: 30. C
Capillary	HP-5 MS	1018.	Forero, Quijano, et al., 2008	30. m/0.25 mm/0.25 μm, Helium, 50. C @ 4. min, 4. K/min, 230. C @ 10. min
Capillary	ZB-1	995.	Mierendorff, Stahl-Biskup, et al., 2008	30. m/0.25 mm/0.25 μm, Nitrogen, 3. K/min; T_start: 45. C; T_end: 230. C
Capillary	DB-1	998.	Audino, Alzogaray, et al., 2007	He, 50. C @ 2. min, 6. K/min, 220. C @ 20. min; Column length: 30. m; Phase thickness: 0.25 μm
Capillary	HP-5	1021.	Pino, Sauri-Duch, et al., 2006	30. m/0.25 mm/0.25 μm, H2, 50. C @ 2. min, 4. K/min, 280. C @ 10. min
Capillary	HP-5	1018.3	Leffingwell and Alford, 2005	60. m/0.32 mm/0.25 μm, He, 30. C @ 2. min, 2. K/min, 260. C @ 28. min
Capillary	ZB-1	995.	Mierendorff, Stahl-Biskup, et al., 2003	30. m/0.25 mm/0.25 μm, N2, 3. K/min; T_start: 45. C; T_end: 230. C
Capillary	DB-5	1013.	Zoghbi, Andrade, et al., 2002	30. m/0.25 mm/0.25 μm, He, 3. K/min; T_start: 60. C; T_end: 240. C
Capillary	HP-5	1017.	Gallori, Flamini, et al., 2001	30. m/0.25 mm/0.25 μm, N2, 60. C @ 10. min, 5. K/min; T_end: 220. C
Capillary	DB-1	994.	Shiota, 1993	30. m/0.25 mm/0.25 μm, He, 50. C @ 3. min, 5. K/min; T_end: 240. C
Capillary	DB-1	998.	Shiota, 1993	30. m/0.25 mm/0.25 μm, He, 50. C @ 3. min, 5. K/min; T_end: 240. C
Capillary	OV-101	997.	Anker, Jurs, et al., 1990	2. K/min; Column length: 50. m; Column diameter: 0.28 mm; T_start: 80. C; T_end: 200. C

Normal alkane RI, non-polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	HP-5 MS	1014.	Nance and Setzer, 2011	30. m/0.25 mm/0.25 μm, Helium; Program: 40 0C (10 min) 3 0C/min -> 200 0C 2 0C/min -> 220 0C
Capillary	SLB-5 MS	1014.	Costa, De Fina, et al., 2008	30. m/0.25 mm/0.25 μm, Helium; Program: 50 0C 3 0C/min -> 250 0C (1 min) 10 0C/min -> 300 0C (5 min)
Capillary	SLB-5 MS	1007.	Costa, De Fina, et al., 2008	30. m/0.25 mm/0.25 μm, Helium; Program: not specified
Capillary	SE-30	994.	Liu, Liang, et al., 2007	Program: not specified
Capillary	HP-5	1011.	Splivallo, Bossi, et al., 2007	He; Program: 50C => 3C/min => 200C(10min) => 10C/min => 290C(10min)
Capillary	SE-52	1019.	Tognolini, Barocelli, et al., 2006	30. m/0.32 mm/0.15 μm, He; Program: 45C => 1C/min => 100C => 5C/min => 250C (10min)
Capillary	SE-30	997.	Vinogradov, 2004	Program: not specified
Capillary	CP Sil 5 CB	992.	Lermusieau, Bulens, et al., 2001	50. m/0.32 mm/1.2 μm; Program: 36C => 20C/min => 120C(20min) => 2C/min => 250C(30min)

Normal alkane RI, polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	CP-Wax CB	1194.	Alves, da Penha, et al., 2012	30. m/0.25 mm/0.25 μm, Helium, 2. K/min, 150. C @ 5. min; T_start: 50. C
Capillary	CP-Wax 52CB	1183.	Audino, Alzogaray, et al., 2007	He, 50. C @ 2. min, 6. K/min, 220. C @ 20. min; Column length: 30. m; Phase thickness: 0.32 μm
Capillary	DB-Wax	1234.	Alves and Franco, 2003	30. m/0.25 mm/0.5 μm, H2, 50. C @ 10. min, 3. K/min, 200. C @ 10. min
Capillary	DB-Wax	1183.	Wei, Mura, et al., 2001	60. m/0.25 mm/0.25 μm, He, 2. K/min; T_start: 40. C; T_end: 200. C
Capillary	Carbowax 20M	1187.	Anker, Jurs, et al., 1990	2. K/min; Column length: 80. m; Column diameter: 0.2 mm; T_start: 70. C; T_end: 170. C

Normal alkane RI, polar column, custom temperature program

View large format table.

Column type	Active phase	I	Reference	Comment
Capillary	Innowax FSC	1195.	Polatoglu, Demirci, et al., 2010	60. m/0.25 mm/0.25 μm, Helium; Program: 60 0C (10 min) 4 0C/min -> 220 0C (10 min) 1 0C/min -> 240 0C
Capillary	Carbowax 20M	1187.	Vinogradov, 2004	Program: not specified

References

Go To: Top, Phase change data, Gas Chromatography, Notes

Lecat, 1943
Lecat, M., Azeotropes of Ethyl Urethane and other Azeotropes, C. R. Hebd. Seances Acad. Sci., 1943, 217, 273. [all data]

Lecat, 1927
Lecat, M., New binary azeotropes: 6th list, Ann. Soc. Sci. Bruxelles, Ser. B, 1927, 47, 63-71. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Ashes and Haken, 1974
Ashes, J.R.; Haken, J.K., Gas chromatography of homologous esters. VI. Structure-retention increments of aliphatic esters, J. Chromatogr., 1974, 101, 1, 103-123, https://doi.org/10.1016/S0021-9673(01)94737-5 . [all data]

Ashes and Haken, 1971
Ashes, J.R.; Haken, J.K., Gas chromatography of homologous esters. Part V. Retention of aliphatic esters on non-polar, donar and acceptor stationary phases, J. Chromatogr., 1971, 60, 33-44, https://doi.org/10.1016/S0021-9673(00)95527-4 . [all data]

Germaine and Haken, 1969
Germaine, R.W.; Haken, J.K., Gas chromatography of homologous esters. Part 1. Simple aliphatic esters, J. Chromatogr., 1969, 43, 33-42, https://doi.org/10.1016/S0021-9673(00)99162-3 . [all data]

Srivastava, Ahmad, et al., 2003
Srivastava, S.K.; Ahmad, A.; Syamsunder, K.V.; Aggarwal, K.K.; Shanuja, S.P.S., Essential oil composition of Callistemon viminalis leaves from India, Flavour Fragr. J., 2003, 18, 5, 361-363, https://doi.org/10.1002/ffj.1143 . [all data]

Chretien and Dubois, 1978
Chretien, J.R.; Dubois, J-E., Topological Analysis: A Technique for the Physico-Chemical Exploitation of Retention Data in Gas-Liquid Chromatography, J. Chromatogr., 1978, 158, 43-56, https://doi.org/10.1016/S0021-9673(00)89954-9 . [all data]

Tressl, Friese, et al., 1978
Tressl, R.; Friese, L.; Fendesack, F.; Köppler, H., Gas chromatographic--mass spectrometric investigation of hop aroma constituents in beer, J. Agric. Food Chem., 1978, 26, 6, 1422-1426, https://doi.org/10.1021/jf60220a037 . [all data]

Omidbaigi, Sefidkon, et al., 2004
Omidbaigi, R.; Sefidkon, F.; Kazemi, F., Influence of drying methods on the essential oil content and composition of Roman chamomile, Flavour Fragr. J., 2004, 19, 3, 196-198, https://doi.org/10.1002/ffj.1340 . [all data]

Moio and Addeo, 1998
Moio, L.; Addeo, F., Grana Padano cheese aroma, J. Dairy Res., 1998, 65, 2, 317-333, https://doi.org/10.1017/S0022029997002768 . [all data]

Andriamaharavo, 2014
Andriamaharavo, N.R., Retention Data. NIST Mass Spectrometry Data Center., NIST Mass Spectrometry Data Center, 2014. [all data]

Eri, Khoo, et al., 2000
Eri, S.; Khoo, B.K.; Lech, J.; Hartman, T.G., Direct thermal desorption-gas chromatography and gas chromatography-mass spectrometry profiling of hop (Humulus lupulus L.) essential oils in support of varietal characterization, J. Agric. Food Chem., 2000, 48, 4, 1140-1149, https://doi.org/10.1021/jf9911850 . [all data]

Fang and Qian, 2005
Fang, Y.; Qian, M., Aroma compounds in Oregon Pinot Noir wine determined by aroma extract dilution analysis (AEDA), Flavour Fragr. J., 2005, 20, 1, 22-29, https://doi.org/10.1002/ffj.1551 . [all data]

Bianchi, Careri, et al., 2007
Bianchi, F.; Careri, M.; Mangia, A.; Musci, M., Retention indices in the analysis of food aroma volatile compounds in temperature-programmed gas chromatography: Database creation and evaluation of precision and robustness, J. Sep. Sci., 2007, 39, 4, 563-572, https://doi.org/10.1002/jssc.200600393 . [all data]

Leffingwell and Alford, 2011
Leffingwell, J.; Alford, E.D., Volatile constituents of the giant pufball mushroom (Calvatia gigantea), Leffingwell Rep., 2011, 4, 1-17. [all data]

Forero, Quijano, et al., 2008
Forero, M.D.; Quijano, C.E.; Pino, J.A., Volatile compounds of Chile pepper (Capsicum annuum L. var. glabriusculum) at two ripening stages, Flavour Fragr. J., 2008, 24, 1, 25-30, https://doi.org/10.1002/ffj.1913 . [all data]

Mierendorff, Stahl-Biskup, et al., 2008
Mierendorff, H.-G.; Stahl-Biskup, E.; Posthumus, M.A.; van Beek, T.A., Composition of commercial Cape chamomile oil (Eriocephalus punctuatus / Eriocephalus tenuifolius), 2008, retrieved from http://www.chemische-analysen-hamburg.de/Publikationen?Cape_Chamomile_Oil/. [all data]

Audino, Alzogaray, et al., 2007
Audino, P.G.; Alzogaray, R.A.; Vassena, C.; Masuh, H.; Fontán, A.; Gatti, P.; Martínez, A.; Camps, F.; Cork, A.; Zerba, E., Volatile compounds secreted by Brindley's glands of adult Triatoma infestans: identification and biological activity of previously unidentified compounds, Journal of Vector Ecology, 2007, 32, 1, 75-82, https://doi.org/10.3376/1081-1710(2007)32[75:VCSBBO]2.0.CO;2 . [all data]

Pino, Sauri-Duch, et al., 2006
Pino, J.; Sauri-Duch, E.; Marbot, R., Changes in volatile compounds of Habanero chile pepper (Capsicum chinense Jack. cv. Habanero) at two ripening stages, Food Chem., 2006, 94, 3, 394-398, https://doi.org/10.1016/j.foodchem.2004.11.040 . [all data]

Leffingwell and Alford, 2005
Leffingwell, J.C.; Alford, E.D., Volatile constituents of Perique tobacco, Electron. J. Environ. Agric. Food Chem., 2005, 4, 2, 899-915. [all data]

Mierendorff, Stahl-Biskup, et al., 2003
Mierendorff, H.-G.; Stahl-Biskup, E.; Posthumus, M.A.; van Beek, T.A., Composition of commercial Cape chamomile oil (Eriocephalus punctulatus), Flavour Fragr. J., 2003, 18, 6, 510-514, https://doi.org/10.1002/ffj.1259 . [all data]

Zoghbi, Andrade, et al., 2002
Zoghbi, M.G.B.; Andrade, E.H.A.; da Silva, M.H.; Maia, J.G.S.; Luz, A.I.R.; da Silva, J.D., Chemical variation in the essential oils of Hyptis crenata Pohl ex Benth., Flavour Fragr. J., 2002, 17, 1, 5-8, https://doi.org/10.1002/ffj.1031 . [all data]

Gallori, Flamini, et al., 2001
Gallori, S.; Flamini, G.; Bilia, A.R.; Morelli, I.; Landini, A.; Vincieri, F.F., Chemical composition of some traditional herbal drug preparations: essential oil and aromatic water of costmary (Balsamita suaveolens Pers.), J. Agric. Food Chem., 2001, 49, 12, 5907-5910, https://doi.org/10.1021/jf0107656 . [all data]

Shiota, 1993
Shiota, H., New esteric components in the volatiles of banana fruit (Musa sapientum L.), J. Agric. Food Chem., 1993, 41, 11, 2056-2062, https://doi.org/10.1021/jf00035a046 . [all data]

Anker, Jurs, et al., 1990
Anker, L.S.; Jurs, P.C.; Edwards, P.A., Quantitative structure-retention relationship studies of odor-active aliphatic compounds with oxygen-containing functional groups, Anal. Chem., 1990, 62, 24, 2676-2684, https://doi.org/10.1021/ac00223a006 . [all data]

Nance and Setzer, 2011
Nance, M.R.; Setzer, W.N., Volatile components of aroma hops (Humulus lupulus L.) commonly used in beer brewing, J. of Brewing and Distilling, 2011, 2, 2, 16-22. [all data]

Costa, De Fina, et al., 2008
Costa, R.; De Fina, M.R.; Valentino, M.R.; Rustaiyan, A.; Dugo, P.; Dugo, G.; Mondello, L., An investigation on the volatile composition of some Artemisia species from Iran, Flavour Fragr. J., 2008, 24, 2, 75-82, https://doi.org/10.1002/ffj.1919 . [all data]

Liu, Liang, et al., 2007
Liu, F.; Liang, Y.; Cao, C.; Zhou, N., QSPR study of GC retention indices for saturated esters on seven stationary phases based on novel topological indices, Talanta, 2007, 72, 4, 1307-1315, https://doi.org/10.1016/j.talanta.2007.01.038 . [all data]

Splivallo, Bossi, et al., 2007
Splivallo, R.; Bossi, S.; Maffei, M.; Bonfante, P., Discrimination of truffle fruiting body versus mycelial aromas by stir bar sorptive extraction, Phytochemistry, 2007, 68, 20, 2584-2598, https://doi.org/10.1016/j.phytochem.2007.03.030 . [all data]

Tognolini, Barocelli, et al., 2006
Tognolini, M.; Barocelli, E.; Ballabeni, V.; Bruni, R.; Bianchi, A.; Chiavarini, M.; Impicciatore, M., Comparative screening of plant essential oils: Phenylpropanoid moiety as basic core for antiplatelet activity, Life Sciences, 2006, 78, 13, 1419-1432, https://doi.org/10.1016/j.lfs.2005.07.020 . [all data]

Vinogradov, 2004
Vinogradov, B.A., Production, composition, properties and application of essential oils, 2004, retrieved from http://viness.narod.ru. [all data]

Lermusieau, Bulens, et al., 2001
Lermusieau, G.; Bulens, M.; Collin, S., Use of GC-olfactometry to identify the hop aromatic compounds in beer, J. Agric. Food Chem., 2001, 49, 8, 3867-3874, https://doi.org/10.1021/jf0101509 . [all data]

Alves, da Penha, et al., 2012
Alves, V.C.C.; da Penha, M.F.A.; Pinto, N. deO.F.; Garruti, D. dosS., Volatile compounds profile of Musa FHIA 02: an option to counter losses by Black Sigatoka, Nat. Prod. J., 2012, 5, 55-60. [all data]

Alves and Franco, 2003
Alves, G.L.; Franco, M.R.B., Headspace gas chromatography-mass spectrometry of volatile compounds in murici (Byrsonima crassifolia L. Rich), J. Chromatogr. A, 2003, 985, 1-2, 297-301, https://doi.org/10.1016/S0021-9673(02)01398-5 . [all data]

Wei, Mura, et al., 2001
Wei, A.; Mura, K.; Shibamoto, T., Antioxidative activity of volatile chemicals extracted from beer, J. Agric. Food Chem., 2001, 49, 8, 4097-4101, https://doi.org/10.1021/jf010325e . [all data]

Polatoglu, Demirci, et al., 2010
Polatoglu, K.; Demirci, F.; Demirci, B.; Goren, N.; Baser, K.H.C., Antimicrobial activity and essential oil composition of a new T. argyrophyllum (C. Koch) Tvzel var. argyrophyllium chemotype, J. Oleo Sci., 2010, 59, 6, 307-313, https://doi.org/10.5650/jos.59.307 . [all data]

Notes

Go To: Top, Phase change data, Gas Chromatography, References

Symbols used in this document:

T_boil Boiling point

Δ_vapH Enthalpy of vaporization
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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