Highly efficient and selective acetylation of alcohols and phenols with acetic anhydride catalyzed by a high-valent tin(IV) porphyrin, Sn(TPP)(BF4)2

Highly efficient chemical fixation of carbon dioxide catalyzed by high-valent tetraphenylporphyrinatotin(IV) triflate

“…In continuation of our works on the use of tetraphenylporphyrinatotin(IV) perchlorate [26,27], tetraphenylporphyrinatotin (IV) trifluoromethanesulfonate [28][29][30], and tetraphenylporphyrinatotin (IV) tetrafluoroborate [31][32][33] in organic transformations, in the present work, we report an efficient method for chemical fixation of carbon dioxide with epoxides catalyzed by electron-deficient [Sn IV (TPP)(OTf) 2 ] at ambient pressure and temperature (Scheme 1).…”

“…The porphyrin ligand was prepared and metallated according to the literature [34,35] The [Sn IV (TPP)(BF 4 ) 2 ] and [Sn IV (TPP)(OTf) 2 ] catalysts were prepared as reported previously [31,36].…”

M(acac)n Covalently Anchored onto Amine Functionalized Silica: Highly Efficient and Recyclable Heterogeneous Catalysts for the Acetylation of Amines, Phenols and Alcohols Under Solvent-Free Conditions

“…These transformations are usually performed with acetic anhydride and/or acetyl chloride in the presence of stoichiometric amounts of either basic or acidic catalysts. A variety of procedures using homogeneous or heterogeneous catalysts [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have been reported for this transformation. Although these procedures provide an improvement, yet many of these catalysts or activators need long reaction times, drastic reaction conditions or tedious work-up, and the catalysts are moisture sensitive or expensive.…”

Rapid, highly efficient and chemoselective trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) catalyzed by reusable electron‐deficient tin(IV)porphyrin

“…They used Cr(tpp)Cl for regioselective [3,3] rearrangement of aliphatic allyl vinyl ethers and for Claisen rearrangement of simple aliphatic allyl vinyl ethers, Fe(tpp)OTf for rearrangement of α,β-epoxy ketones into 1,2-diketones and Cr(tpp)OTf for highly regio-and stereoselective rearrangement of epoxides to aldehydes. [33 -36] Recently, we have reported the use of tin(IV)tetraphenylporphyrinato perchlorate, [37,38] tin(IV)tetraphenylporphyrinato trifluoromethanesulfonate [39,40] and tin(IV)tetraphenylporphyrinato tetraflouroborate [41,42] in organic transformations.…”