Identification of New, Odor-Active Thiocarbamates in Cress Extracts and Structure−Activity Studies on Synthesized Homologues
作者:Katharina Breme、Xavier Fernandez、Uwe J. Meierhenrich、Hugues Brevard、Daniel Joulain
DOI:10.1021/jf062856e
日期:2007.3.1
botanical order Brassicales and produces glucosinolates, which are important precursors of nitrogen- and sulfur-containing compounds. Those compounds often present low perception thresholds and various olfactive notes and are thus of interest to the flavor and fragrance chemistry. When the study of organonitrogen and organosulfur compounds is undertaken, Brassicale extracts are one of the matrices of choice
Process to prepare alkyl-ureas from O,S-dimethyl dithiocarbonate
申请人:Oxon Italia S.p.A.
公开号:US06723875B1
公开(公告)日:2004-04-20
The present invention relates to the preparation of alkyl-ureas, starting from O,S-dimethyl dithiocarbonate, which provides the following steps:
A) causing the O,S-dimethyl dithiocarbonate to react with a primary amine of general formula R1NH2 in order to obtain an O-methyl thiocarbamate;
B) isomerising the O-methyl thiocarbamate in order to obtain an S-methyl thiocarbamate;
C) causing the S-methyl thiocarbamate with a compound of general formula R′R″NH, wherein R′ and R″ may be equal or different one in respect of the other and of R1 and may be H, R2 or R3, in order to obtain one of the alkyl-ureas of formula (4), (5) or (6).
作者:Sagun K. Tandel、Srinivasachari Rajappa、Sunil V. Pansare
DOI:10.1016/s0040-4020(01)87224-0
日期:1993.8
Treatment of methyl N-methylthionocarbamate (2a) with a catalytic amount of iodine or conc. H2SO4 results in the unexpected formation of the isomer, methyl N-methylthiolcarbamate (3a) in 90% yield. This has subsequently been transformed into methyl N-methylcarbamate (4a), by sodium methoxide. A curious transformation of methyl N-methyldithiocarbamate (1a) to (4a) on prolonged treatment with sodium
用催化量的碘或浓盐酸处理N-甲基硫代氨基甲酸甲酯(2a)。H 2 SO 4导致以90%的产率出乎意料地形成了异构体N-甲基硫醇氨基甲酸甲酯(3a)。随后通过甲醇钠将其转化为N-甲基氨基甲酸甲酯(4a)。还讨论了用甲醇钠长时间处理后甲基N-甲基二硫代氨基甲酸酯(1a)到(4a)的奇怪转变。
Facile and High-Yielding Direct Synthesis of 2-Alkyliminothiazolines
作者:Stefania Santeusanio、Orazio A. Attanasi、Gianni Carvoli、Paolino Filippone、Francesca R. Perrulli、Anna Maria Serri
DOI:10.1055/s-2004-825610
日期:——
1,2-Diaza-1,3-butadienes readily react with O-alkylthiocarbamate derivatives via a hetero-Michael addition/cyclization reaction affording directly 2-alkyliminothiazolines in high yields under mild conditions.
Dipole moments and charge-transfer parameters of the iodine complexes of some oxygen and sulfur donors
作者:S. N. Bhat、C. N. R. Rao
DOI:10.1021/ja01024a012
日期:1968.10
charge-transfer complexes of some sulfur (sulfide and thiocarbonyl) and oxygen (ether and carbonyl) donors with iodine have been determined and the various charge-transfer parameters have been calculated by making use of the charge-transfer transition energies and heats of formation of the complexes. The contribution of the charge-transfer structure in the ground state appears to be greater in the complexes of