trans-3-Methyl-4-octanolide

*trans*-3-Methyl-4-octanolide
Names
	IUPAC name (4R,5S)-5-butyl-4-methyldihydrofuran-2(3H)-one
Identifiers
CAS Number	(4R,5S): 105119-22-0 (-) ; (4S,5R): 80041-01-6 (+) ;
3D model (JSmol)	(4R,5S): Interactive image; (4S,5R): Interactive image;
ChemSpider	(4R,5S): 9280733 ; (4S,5R): 9259269;
PubChem CID	(4R,5S): 11105597; (4S,5R): 11084123;
UNII	(4R,5S): 9OQS29SV9M; (4S,5R): 7A29T3GS95;
CompTox Dashboard (EPA)	(4R,5S): DTXSID20146959 ; (4S,5R): DTXSID801017484;
	InChI InChI=1S/C9H16O2/c1-3-4-5-8-7(2)6-9(10)11-8/h7-8H,3-6H2,1-2H3/t7-,8+/m1/s1 ; (4R,5S): InChI=1S/C9H16O2/c1-3-4-5-8-7(2)6-9(10)11-8/h7-8H,3-6H2,1-2H3/t7-,8+/m0/s1;
	SMILES (4R,5S): O=C1O[C@@H](CCCC)[C@@H](C1)C; (4S,5R): CCCC[C@H]1OC(=O)C[C@@H]1C;
Properties
Chemical formula	C9H16O2
Molar mass	156.222
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

trans-3-Methyl-4-octanolide, also called trans-β-methyl-γ-octalactone is a chemical compound of the lactone family with formula C
₉H
₁₆O
₂. It exists in two stereoisomers: (3R,4S) and (3S,4R).

The (3S,4R) form is found in whiskey and other alcoholic beverages that have been aged in oak barrels, together with the more important cis isomer.^[1]^[2] It has a coconut, celery or fresh wood aroma, that can be detected by humans at the concentration of 20 μg/L in air.^[3] A mixture of the cis and trans isomers is repellent for mosquitos and flies.^[4]

The (3S,4R) isomer is extracted by the alcoholic beverage from some precursor substances in the oak wood.^[5] It can be synthesized in various ways.^[3]^[6]^[7]

References[edit]

^ "Aromas and Flavours". Wine-Pages.com. Archived from the original on 2007-10-18. Retrieved 2007-12-18.
^ Hans-Dieter Belitz, Peter Schieberle, and Werner Grosch (2004) Food Chemistry, page 383. Springer, ISBN 3-540-40818-5
^ ^a ^b Eric Masson, Raymond Baumes, Christine Le Guernevé, and Jean-Louis Puech (2000) Identification of a Precursor of β-Methyl-γ-octalactone in the Wood of Sessile Oak (Quercus petraea (Matt.) Liebl.). J. Agric. Food Chem. volume 48, pages 4306-4309
^ Yukio Suzuki, Wakako Mori, Hiroyuki Ishizone, Koichi Naito, and Toshio Honda (1992) Concise Enantiospecific Syntheses of (+)-Eldanolide and (−)-cis-Whisky Lactone. Tetrahedron letters, volume 33, pages 4931-4932 doi:10.1016/S0040-4039(00)61237-6
^ Masuda and Nishimura (1971), Branched nonalactones from some Quercus species. Phytochemistry, volume 10, pages 1401-1402.
^ Hisashi Nishikori, Katsuji Ito, and Tsutomu Katsuki (1998) A short-step synthesis of trans-whisky lactone by an asymmetric Michael reaction. Tetrahedron: Asymmetry, volume 9, pages 1165–1170.
^ Katsuji Ito, Miwa Yoshitake and Tsutomu Katsuki (1995), Enantioselective Synthesis of trans-Whisky Lactone by Using Newly Developed Asymmetric Ring Expansion Reaction of Oxetane as a Key Step. Chemistry Letters, volume 24, issue 11, page 1027 doi:10.1246/cl.1995.1027

[1] "Aromas and Flavours". Wine-Pages.com. Archived from the original on 2007-10-18. Retrieved 2007-12-18.

[berlitz-2] Hans-Dieter Belitz, Peter Schieberle, and Werner Grosch (2004) Food Chemistry, page 383. Springer, ISBN 3-540-40818-5

[masson-3] Eric Masson, Raymond Baumes, Christine Le Guernevé, and Jean-Louis Puech (2000) Identification of a Precursor of β-Methyl-γ-octalactone in the Wood of Sessile Oak (Quercus petraea (Matt.) Liebl.). J. Agric. Food Chem. volume 48, pages 4306-4309

[suzuki-4] Yukio Suzuki, Wakako Mori, Hiroyuki Ishizone, Koichi Naito, and Toshio Honda (1992) Concise Enantiospecific Syntheses of (+)-Eldanolide and (−)-cis-Whisky Lactone. Tetrahedron letters, volume 33, pages 4931-4932 doi:10.1016/S0040-4039(00)61237-6

[masuda-5] Masuda and Nishimura (1971), Branched nonalactones from some Quercus species. Phytochemistry, volume 10, pages 1401-1402.

[nishi-6] Hisashi Nishikori, Katsuji Ito, and Tsutomu Katsuki (1998) A short-step synthesis of trans-whisky lactone by an asymmetric Michael reaction. Tetrahedron: Asymmetry, volume 9, pages 1165–1170.

[ito-7] Katsuji Ito, Miwa Yoshitake and Tsutomu Katsuki (1995), Enantioselective Synthesis of trans-Whisky Lactone by Using Newly Developed Asymmetric Ring Expansion Reaction of Oxetane as a Key Step. Chemistry Letters, volume 24, issue 11, page 1027 doi:10.1246/cl.1995.1027

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References[edit]