o-Benzenedisulfonimide has been used for the first time as a Brønsted acid catalyst to induce electrocyclization of dienones into cyclopentenones (Nazarov reaction). The catalyst has been used in various organic solvents or under solvent-free conditions and it is entirely recoverable from the reaction mixture. The versatility and the effectiveness of the proposed procedure is demonstrated on a wide range of both activated and inactivated substrates.
Pyrrole compound, method of making same, and aroma composition, food, drink and cosmetics containing same
申请人:T. HASEGAWA CO., LTD.
公开号:US11332694B2
公开(公告)日:2022-05-17
A compound represented by the following formula (1):
wherein, R1 is a linear or branched alkyl group having 1 to 3 carbon atoms or a hydroxyl group; and R2 is a 1-pyrrolyl group, a 2-pyrrolyl group, or a 3-pyrrolyl group. The present invention can provide a means highly effective in contributing to savory roasting flavor and capable of imparting fragrance with natural feeling.
THOMAS A. F.; OZAINNE M.; GUNTZ-DUBINI R., CAN. J. CHEM., 1980, 58, NO 17, 1810-1820
作者:THOMAS A. F.、 OZAINNE M.、 GUNTZ-DUBINI R.
DOI:——
日期:——
HEILMANN, WERNER;AZIZUR-RAHMAN;BAUML, ENGLBERT;MAYR, HERBERT, TETRAHEDRON., 44,(1988) N 19, C. 6047-6054
作者:HEILMANN, WERNER、AZIZUR-RAHMAN、BAUML, ENGLBERT、MAYR, HERBERT
DOI:——
日期:——
PYRROLE COMPOUND, AROMA COMPOSITION, AND FOOD AND DRINK AND COSMETICS CONTAINING THE SAME
申请人:T. HASEGAWA CO., LTD.
公开号:US20200157463A1
公开(公告)日:2020-05-21
A compound represented by the following formula (1):
wherein, R
1
is a linear or branched alkyl group having 1 to 3 carbon atoms or a hydroxyl group; and R
2
is a 1-pyrrolyl group, a 2-pyrrolyl group, or a 3-pyrrolyl group. The present invention can provide a means highly effective in contributing to savory roasting flavor and capable of imparting fragrance with natural feeling.