Described are furyl and phenyl mercaptals defined according to the generic structure: ##STR1## wherein the dashed line represents a carbon-carbon single bond or no bond; wherein R.sub.1 and R.sub.2 are the same or different and each represents hydrogen, methyl or ethyl; wherein p is 0 or 1; and wherein X represents a phenyl moiety having the structure: ##STR2## or a furyl moiety having the structure: ##STR3## and uses thereof in augmenting or enhancing the aroma or taste of foodstuffs.
Furyl and phenyl mercaptals and use thereof in augmenting or enhancing
申请人:International Flavors & Fragrances Inc.
公开号:US04515968A1
公开(公告)日:1985-05-07
Described are furyl and phenyl mercaptals defined according to the generic structure: ##STR1## wherein the dashed line represents a carbon-carbon single bond or no bond; wherein R.sub.1 and R.sub.2 are the same or different and each represents hydrogen, methyl or ethyl; wherein p is 0 or 1; and wherein X represents a phenyl moiety having the structure: ##STR2## or a furyl moiety having the structure: ##STR3## and uses thereof in augmenting or enhancing the aroma or taste of foodstuffs.
Regioselective transformation of alkynes into cyclic acetals and thioacetals with a gold(I) catalyst: comparison with Brønsted acid catalysts
作者:Laura L. Santos、Violeta R. Ruiz、Maria J. Sabater、Avelino Corma
DOI:10.1016/j.tet.2008.06.032
日期:2008.8
Au(I) catalyzes the transformation of alkynes into cyclic acetals and thioacetals at much higher rate than Brønsted acids. The reaction appears to be general for a range of alkynes and diols or dithiols, which are efficiently transformed with high selectivities. One of the salient features of this reaction process is the high reactivity of the enol ether or enol thioether intermediates, which undergo