Synthesis of 2-I-closo-B10H92- by Iodination of closo-B10H120-

A pure salt 2-I-B₁₀H₉ ^{2 -}[N⁺(C₄H₉)4]₂ was obtained by treatment of ethanolic Na2⁺B10H₁ ² ₀ ^- with ethanolic iodine at -75°C, followed by addition of tetrabutylammonium bromide.     

Total synthesis of (+/-)-2-O-methylneovibsanin H

The total synthesis of (+/-)-2- O-methylneovibsanin H was achieved in 12 steps. An acid-catalyzed, one-pot, four-step cascade reaction was key to the concise total synthesis, lending support to the proposed biosynthesis.     

Synthesis of 9-C6H5-3-(π-C5H5)-3,1,2-CoC2B9H10 by cross-coupling reaction of 9-I-3-(π-C5H5)-3,1,2-CoC2B9H10 with C6H5ZnCl catalyzed by palladium complexes

The cross-coupling reaction of 9-I-3-(π-C₅H₅)-3,1,2-CoC₂B₉H₁₀ with organozinc compounds catalyzed by palladium complexes was used to synthesize the first representative ofB-phenyl-substituted carboranes, 9-C₆H₅-3-(π-C₅H₅)-3,1,2-CoC₂B₉H₁₀. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No: 6, pp. 1253–1254, June, 1998.     

Synthesis of 2,4-(1H,3H)-quinazolinediones

Improved procedures for syntheses of kilogram quantities of quinazolinedione 5 and its intermediates 2,3 and 4 are described. The mechanism of formation of 5 is discussed as well as a side reaction resulting in 7 .     

1,2-2(H)-1,3,2-Benzoxazaphosphorine-2-Sulfide

Abstract

Reports [1-5] concerning the preparation of benzo-1,3,2-benzoxazaphosphonaline containing a substituent on nitrogen have been published. The synthesis of parent compund, 1,2-dinydro-1,3,2-benzoxazaphosphorine, has not been reported. We found that it can be easily synthesized pY the reaction of salicylic aldehyde with O-alkyl-phosphoryl dichlorides and ammonia.     

Coherent excitation of H(n=2) in H+, H - He collisions

The coherent excitation of H(n=2) in H⁺, H - He collisions was investigated at incident energies of 5–25 keV. From a polarization analysis of the emitted Lyman-α radiation as a function of an external electric field, the partial cross sections for excitation to the H(2s) and the H(2p _m) magnetic substates and the real part of thes ?p ₀-coherence were extracted. For H⁺-He collisions, the measured partial cross sections are in fair agreement with previous two-electron calculations by Kimura and Lin; the agreement with one-electron calculations of Jain et al. is, particularly at the lower incident energies, less satisfactory. For both collision systems, an energy-dependent forward-backward asymmetry corresponding to a shift of the center-of-charge relative to the center-of-mass (dipole moment) was observed. In H⁺ - He collisions, the measured dipole moment was positive; it thus corresponds to an electron trailing behind the proton. The same analysis applied to the H - He system showed the electron riding in front of the proton.     

A convenient method for the preparation of [1-2H]- and [1-3H]-terminal acetylenes

Conclusions A convenient one-step method has been proposed for the preparation of 1-isotope-substituted acetylenes based on the use of a phase transfer catalyst.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No, 8, pp. 1921–1922, August, 1985.     

Monocarbaborane anion chemistry. The elusive C-arylated [PhCB11H11]-, [PhCB9H9]- and [PhCB8H8]- anions

B10H14 and PhCHO yield [6-Ph-nido-6-CB9H11]- (94%), from which the nine-vertex C-phenyl monocarbaborane anion [4-Ph-closo-4-CB8H8]- (68%) can be obtained by heating at 200 degrees C, and from which the twelve- and ten-vertex analogues [1-Ph-closo-1-CB11H11]- (50%) and [4-Ph-closo-4-CB9H9]- (25%) can be obtained by heating at 210 degrees C with BH3(NEt3).     

Synthesis and structure of 1-(p-cyanophenyl)-1-carba-closo-decaborate [1-(p-NCC6H4)-1-CB9H9]−

Russian Chemical Bulletin - The reaction of decaborane-14 with para-cyanobenzaldehyde afforded the corresponding derivatives of the 1- and 2-carba-closo-decaborate anions...     

Synthesis of 3-(aminooxoethyl)-6-methyl-1-(thiethan-3-yl)-pyrimidine-2,4-(1H,3H)-diones

A new approach to prepare 2-chloroacetamides has been developed, based on the reaction of chloroacetyl chloride with excess of secondary amines. Alkylation of 6-methyl-1-(thiethan-3-yl)pyrimidine-2,4(1H,3H)-dione with the synthesized 2-chloroacetamides in the presence of potassium carbonate has afforded N ³-acetamido-substituted 6-methyl-1-(thiethan-3-yl)pyrimidine-2,4(1H,3H)-diones.     

Electronic effects of 1-(1, 7-B6H6C2H) and 1-(1,6-B7H7C2H) groups

Conclusions 1-[1,7-Dicarbaclozooctaboran(8)yl] (induction constant _i=0.08 and resonance constant _R°=–0.02) and 1-[1,6-dicarbaclozononaboran(9)yl] (=0.09 and _R°=0.05) groups are weak electron-acceptor groupings.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 574–576, March, 1972.