Hydroamination of isocyanates and isothiocyanates by alkaline earth metal initiators supported by a bulky iminopyrrolyl ligand
作者:Kulsum Bano、Srinivas Anga、Archana Jain、Hari Pada Nayek、Tarun K. Panda
DOI:10.1039/d0nj01509a
日期:——
A series of new heteroleptic alkalineearth (Ae) metal complexes of general formula [(Ph2CHNCH)2C4H2N}AeI(THF)3] Ae = Ca (2), Sr (3), and Ba (4)} were synthesized via salt metathesis by reacting potassium salt of ligand 1-K [(Ph2CHNCH)2C4H2N}K(THF)2] with anhydrousalkalineearthmetal diiodides (AeI2). The homoleptic calcium and barium complexes [(Ph2CHNCH)2C4H2N}2Ae] [Ae = Ca (5), Ba (6)] were
一系列新的通式为[(Ph 2 CHN CH)2 C 4 H 2 N} AeI(THF)3的杂碱土金属(Ae)金属配合物Ae = Ca(2),Sr(3)和通过配位1-K [((Ph 2 CHN CH)2 C 4 H 2 N} K(THF)2 ]的钾盐与无水碱土金属二碘化物(AeI 2)反应,通过盐复分解反应合成Ba(4)} 。均钙和钡复合物[(Ph 2 CHN CH)2 C 4 H 2 N} 2 Ae] [Ae = Ca( 5),Ba( 6)]是通过用质子处理金属双六甲基二硅叠氮化物[Ae N(SiMe 3) 2 } 2(THF) 2 ]制备的摩尔比为1的配体1-H [(Ph 2 CH–NCH) 2 C 4 H 2 NH]。钙络合物5 用作活性预催化剂,在纯净条件下,在杂枯烯(如苯基异氰酸酯(PhNCO)和苯基异硫氰酸酯(PhNCS))上加成芳基胺的N–H键,其相应尿素和硫脲衍生物的收率高达99%获得。
Synthesis of 1,2,4-oxadiazolidines <i>via</i> [3+2] cycloaddition of nitrones with carbodiimides
An efficient [3+2] cycloaddition of nitrones and carbodiimides has been developed. This 1,3-dipolar cycloaddition features high regioselectivity, mild and metal-free conditions, excellent functional group compatibility, and a broad substrate scope. The X-ray structures of two regio-isomers confirmed the regioselectivity of this transformation.
Use of sulfur and selenium compounds as precursors to nanostructured materials
申请人:THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
公开号:US10253256B2
公开(公告)日:2019-04-09
The presently disclosed subject matter provides processes for preparing nanocrystals, including processes for preparing core-shell nanocrystals. The presently disclosed subject matter also provides sulfur and selenium compounds as precursors to nanostructured materials. The presently disclosed subject matter also provides nanocrystals having a particular particle size distribution.
Tandem regioselective synthesis of tetrazoles and related heterocycles using iodine
作者:Ramesh Yella、Nilufa Khatun、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1039/c0ob01007c
日期:——
carbodiimides). The in situ generated heterocumulene on subsequent treatment with sodium azide at room temperature gave corresponding tetrazoles. The product regioselectivity for unsymmetrical 1,3-disubstituted thioureas was found to be correlated with the basicities (pKa's) of the parent amines attached to the thiourea. Aryl-sec-alkyl unsymmetrical thioureas gave thioamido guanidino products rather than the 5-aminotetrazoles
have been prepared. The structure of these thiazolidones was confirmed by studying their hydrolysis products. Some of these thiazolidones were screened for their fungicidal activity against Aspergillus niger by agar-growth method and found to be more appropriately fungistatic and not fungicidal.