Two novel, non-thiolic, odorless dithiol equivalents, α,α-diacetyl cyclic ketene dithioacetals 2a and 2b, had been developed. A range of carbonyl compounds 3 were converted into corresponding dithioacetals, dithianes 4 and dithiolanes 5, in high yields (up to 99%) in the presence of 2a or 2b. Moreover, 2a and 2b show high chemoselectivity between aldehyde and ketone in thioacetalization.
equivalent, 1 was investigated in the thioacetalization reaction. Various types of aldehydes and ketones 3 were converted to the corresponding dithianes 4 in the presence of 1 in high yields (79-97%). Moreover, 1 exhibited obvious chemoselectivity betweenaldehyde and ketone in this thioacetalization reaction. A mechanism for this thioacetalization reaction is proposed.
SBA-15 functionalized sulfonic acid containing a confined hydrophobic and acidic ionic liquid: a highly efficient catalyst for solvent-free thioacetalization of carbonyl compounds at room temperature
作者:Babak Karimi、Majid Vafaeezadeh
DOI:10.1039/c3ra42286k
日期:——
SBA-15 functionalized sulfonic acid containing a confined ionic liquid has been introduced to convert various carbonylcompounds to their corresponding dithioacetals and dithioketals at room temperature and under solvent-free conditions. It was found that coating SBA-15-Pr-SO3H with the hydrophobic and acidic ionic liquid [OMIm]HSO4 at a loading of 0.8 mL g−1 of silica, afforded paths for faster mass transfer
引入了一种含有受限离子液体的SBA-15官能化磺酸的新应用,可在室温和无溶剂条件下将各种羰基化合物转化为其相应的二硫缩醛和二硫缩酮。发现以0.8 mL g -1的二氧化硅负载疏水性和酸性离子液体[OMIm] HSO 4涂覆SBA-15-Pr-SO 3 H ,提供了将原料更快地质量转移到SBA-15-Pr-SO 3 H中的途径。活动站点。同时,由于酸性位点的协同作用机理,它也可能增加布朗斯台德酸的强度。催化剂可以很容易地回收和再利用至少八个反应循环,而其催化活性只有轻微的损失。
Aluminum hydrogen sulfate [Al(HSO4)3] as an efficient catalyst for the preparation of thioacetals
作者:Majid Ghashang
DOI:10.1007/s11164-012-0802-8
日期:2013.7
Aluminum hydrogen sulfate, as a heterogeneous solid acid catalyst, has been used for the mild conversion of carbonyl compounds to their thioacetals using 1,2- and 1,3-dithiol under ambient conditions with short reaction times in high to excellent yield in acetonitrile as solvent.
Oxidative [1,2]-Brook Rearrangements Exploiting Single-Electron Transfer: Photoredox-Catalyzed Alkylations and Arylations
作者:Yifan Deng、Qi Liu、Amos B. Smith
DOI:10.1021/jacs.7b05165
日期:2017.7.19
Oxidative [1,2]-Brook rearrangements via hypervalent silicon intermediates induced by photoredox-catalyzed single-electron transfer have been achieved, permitting the formation of reactive radical species that can engage in alkylations and arylations.