Silyl group deprotection by Pd/C/H2. A facile and selective method
摘要:
An easy, high yield, RT, short-reaction-time Pd/C hydrogenation of silyl groups is described. This includes TES, TPS, TBS, TBDMS, TIPS, and TBDPS. The relative selectivity of the process has been investigated and we can show, for example, that TES, TPS, TBS, and TBDMS removal can be performed in the presence of TIPS and TBDPS. (C) 2004 Elsevier Ltd. All rights reserved.
Musk made to odor: A new oxy‐oxonia‐Cope macrocyclization to (3Z)‐configured cycloalk‐3‐en‐1‐yl formates is reported, which is useful in the synthesis of unsaturated and saturated macrocyclic ketones (see scheme). The synthesized structures provide new insight into the structure–odor correlation of musks, making it likely for macrocyclic and linear alicyclic musks to address the same olfactory receptors
Polymers from Plant Oils Linked by Siloxane Bonds for Programmed Depolymerization
作者:Chen Cheng、Jake X. Shi、Eun-Hye Kang、Taylor F. Nelson、Michael Sander、Kristopher McNeill、John F. Hartwig
DOI:10.1021/jacs.4c01982
日期:2024.5.8
report a strategy to create polymers that can undergo controlleddepolymerization by linking renewable feedstocks with siloxane bonds. α,ω-Diesters and α,ω-diols containing siloxane bonds were synthesized from an alkenoic ester derived from castor oil and then polymerized with varied monomers, including related biobased monomers. In addition, cyclicmonomers derived from this alkenoic ester and hydrosiloxanes
塑料产量的增加导致塑料废物的积累和有限的化石燃料资源的枯竭。在这种背景下,我们报告了一种通过将可再生原料与硅氧烷键连接来制造可以进行受控解聚的聚合物的策略。含有硅氧烷键的α,ω-二酯和α,ω-二醇是由蓖麻油衍生的烯酸酯合成的,然后与各种单体(包括相关的生物基单体)聚合。此外,制备衍生自该链烯酸酯和氢硅氧烷的环状单体并环化形成含有硅氧烷单元的26元大环内酯。这种大环内酯和丙交酯的连续开环聚合提供了 ABA 三嵌段共聚物。这组含有硅氧烷的聚合物在质子溶剂中或使用六甲基二硅氧烷和酸催化剂进行程序解聚成单体。将含有硅氧烷键的聚酯解聚得到的单体进行再聚合,以证明所选聚合物的环状性。对这些聚合物对酶降解的环境稳定性的评估表明,它们会被来自茄病镰刀菌的真菌角质酶进行酶水解。对13 C 选择性标记单体的土壤微生物代谢的评估揭示了土壤微生物对主链和侧链有机基团的不同代谢。