排序方式: 共有137条查询结果,搜索用时 46 毫秒
91.
A simple and efficient method has been developed for the chemoselective dethioacetalization of dithioacetals to aldehydes and ketones using Oxone-KBr in aqueous acetonitrile at room temperature. 相似文献
92.
Mahmood Tajbakhsh Rahman Hosseinzadeh Farhad Ramzanian‐Lahmali Marzieh Sadatshahabi 《中国化学会会志》2005,52(5):1005-1009
2,6‐Dicarboxypyridinium fluorochromate as a new, rapid, and efficient reagent was prepared and used for the oxidative deprotection of oximes, phenylhydrazones, and semicarbazones to their carbonyl analogues under solvent‐free conditions at room temperature. 相似文献
93.
R. David Crouch Author Vitae 《Tetrahedron》2004,60(28):5833-5871
94.
Majid M. Heravi Farahnaz K. Behbahani Hossien A. Oskooie Rahim Hekmat Shoar 《Tetrahedron letters》2005,46(15):2543-2545
A simple, mild and efficient method for tetrahydropyranylation and dehydropyranylation of alcohols in the presence of ferric perchlorate are described. 相似文献
95.
Meng Zhang Jun Ying Li Guo Wei Zhou Yuan Juan Wu Yong Mei Xia Tian Duo Li 《中国化学快报》2009,20(12):1514-1517
A series of polydimethylsiloxanes containing two primary hydroxyl groups at one single chain end were synthesized by five-step reactions which included esterification, hydroxyl protection, anionic ring-opening polymerization, hydrosilylation and deprotection. The prepared compounds in each step were characterized. The results showed that each step synthesis was successfully carried out and objective products could be achieved. 相似文献
96.
Satish Kumar Singh Krishna Nand Singh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):2339-2343
An efficient deprotection of 1,3-oxathiolanes to carbonyl compounds has been achieved under the mild reaction conditions of tetraethylammonium superoxide in an aprotic medium at room temperature. 相似文献
97.
M. M. Heravi Y. S. Beheshtiha S. H. A. Oskooi R. Hekmat Shoar M. Khalilpoor 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):251-255
Abstract Trimethylsilyl ethers are selectively and rapidly oxidized to the corresponding carbonyl compounds by montmorillonite k-10 supported ammonium chlorochromate under conventional heating and microwave irradition in solvent free condition. 相似文献
98.
《合成通讯》2013,43(22):4077-4087
Abstract A 1:1:1 stoichiometric reaction among CrO3, aqueous HF and pyridine affords orange crystalline pyridinium fluorochromate(VI), C5H5NH[CrO3F] (PFC), in 99.2% isolated yield. The reagent under solvent‐free conditions readily converts benzylic, secondary, and allylic alcohols to the corresponding carbonyls and selectively oxidizes secondary alcohols in the presence of primary alcohols, polycyclic hydrocarbons to cyclic ketones, benzoin to benzil, PPh3 to O?PPh3, methylphenyl sulfide to sulfoxide, cyclohexanone oxime to cyclohexanone, an allylic Δ5‐steroid to the corresponding α,β‐unsaturated ketone and deprotects dioxolanes and dithiolanes to aldehydes; the economic synthesis of PFC, its ease of reaction without solvent, versatility, and high isolated yields of the products are the significant features of the protocol. 相似文献
99.
The combination of 1,4-benzoquinone and a catalytic amount of NaI was found to be effective for the deprotection of dithioacetals. The reactions proceeded efficiently under mild, near-neutral reaction conditions, producing a wide range of aryl and alkyl aldehydes and ketones generally in high yields with good functional group compatibility. The method developed therefore represents a general, facile, and highly applicable approach for deprotecting dithioacetals. 相似文献
100.
Firouz Matloubi Moghaddam Hassan Zali Boeini Dordaneh Zargarani Ghasem Rezanejad Bardajee 《合成通讯》2013,43(8):1093-1096
N‐Benzyl‐DABCO‐ammonium tribromide was found to be an efficient and recyclable reagent for the deprotection of dithioacetals in dichloromethane/methanol at room temperature. The reaction can be performed cleanly, in short time, and in high yield. 相似文献