[SnIV(TPP)(BF4)2]: An efficient and reusable catalyst for chemoselective trimethylsilylation of alcohols and phenols with hexamethyldisilazane

Zinc (II) [tetra(4-methylphenyl)] Porphyrin: a Novel and Reusable Catalyst for Efficient Synthesis of 2,4,5-trisubstituted Imidazoles Under Ultrasound Irradiation

“…Electron-deficient metalloporphyrins have been used as mild and non-toxic Lewis acid catalysts. [40][41][42][43][44] In continuation of our interest on the synthesis of 2,4,5-trisubsti-Javad Safari, Shiva Dehghan Khalili, Sayed Hossein Banitaba, and Hossein Dehghani tuted imidazoles, 45,46 we decided to explore ability of metalloporphyrins in the synthesis of 2,4,5-trisubstituted imidazoles for the first time. Therefore, Zinc (II) [tetra (4-methylphenyl)] porphyrin was used as a mild Lewis acid catalyst for the three-component one-step synthesis of 2,4,5-trisubstituted imidazoles by condensation reaction of 1,2-diketones or α-hydroxyketones with aromatic aldehydes and ammonium acetate under ultrasound irradiation at ambient temperature (Scheme 1).…”

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).…”

Graphene oxide‐bound electron‐deficient tin(IV) porphyrin: a highly efficient and selective catalyst for trimethylsilylation of alcohols and phenols with hexamethyldisilazane

“…They used Cr(tpp)Cl for regioselective [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 . Recently, we have reported the use of tin(IV)tetraphenylporphyrinato perchlorate, tin(IV)tetraphenylporphyrinato trifluoromethanesulfonate, tin(IV)tetraphenylporphyrinato tetrafluoroborate and V(IV)tetraphenylporphyrinato trifluoromethanesulfonate in the ring opening of epoxides, protection of alcohols and phenols, fixation of CO 2 , olefination of aldehydes and cyclopropanation of olefins …”