The bromocyclopentadienyl complex [(eta5-C5H4Br)Re(CO)3] is converted to racemic [(eta5-C5H4Br)Re(NO)(PPh3)(CH2PPh2)] (1 b) similarly to a published sequence for cyclopentadienyl analogues. Treatment of enantiopure (S)-[(eta5-C5H5)Re(NO)(PPh3)(CH3)] with nBuLi and I2 gives (S)-[(eta5-C5H4I)Re(NO)(PPh3)(CH3)] ((S)-6 c; 84 %), which is converted (Ph3C+ PF6 -, PPh2H, tBuOK) to (S)-[(eta5-C5H4I)Re(...

4-Hydroxyquinazoline undergoes neutral conditions with alkyl propiolates in the presence of triphenylphosphine (0.26g), and by α substituation the corresponding  2-(4-oxoquinazolin-3(4H)-yl acrylate was obtained in good yields.

rra»^-mt'r-Trichlorobis(diethylphenylphosphine)phenylnitrene rhenium(V), [Re(NPh)Cl3(Et2PhP)2], has been synthesized from [ReOCl3(Et2PhP)2] and N-trimethylsilylaniline, while rrans-ttZfr-trichlorophenylnitrenebisCtriphenylphosphine) rhenium(V), [Re(NPh)Cl3(Ph3P)2] has been obtained via a novel route, from (Bu4N)[ReOCl4] and N-trimethylsilylanilin. The products were studied by mass spectrometry,...

The synthesis of ferroeene-ethynyl phosphine platinum dichloride complexes based on (FeC=C)"Ph3 _ nP (ta, 11 = 1; tb, 11 = 2; te, 11 = 3; Fe = ferroeenyl, (.,s-CsHs)(.,s-CsH4 )Fe) is deseribed. Air-oxidation of te afforded (FeC= ChP=O (6). Treatment of ta-tc with [(PhC= NJ,PtClz] (2) or [(tht)AuCI] (tht = tetrahydrothiophene) (7), respeetively, gave the heterometallie transition complexes cis-[...

By reaction of [B6H6]2_ with a solution of (SCN)2 in dichloromethane in the presence of solid KOH the hexaisothiocyanatodiborate anion [B2(NCS)6]2~ is formed and can be isolated by fractionated crystallization. The crystal structure of (PNP)2[B2(NCS)6] has been determi­ ned by single crystal X-ray diffraction analysis; triclinic space group P 1 with a=12,282(5), b 12,416(5), c=14,155(5)A, a=68,...

In this work, stable crystalline phosphorus yields are obtained in good yields from the 1:1:1 addition reactions between hydrazine derivatives and dialkyl acetylenedicarboxylates in the presence of triphenylphosphine at room temperature in dichloromethane. This synthetic method has merits of high yields, mild reaction conditions, and simple experimental and work-up conditions. The obtained yiel...

A concise and stereoselective synthesis of racemic erythro-methylphenidate (1) is described. The coupling reaction between piperidine-2-thione (3) and 2-bromo-2-phenylmethylacetate (4) afforded the -enaminocarbonyl compound 2 in 60% yield by a modified Eschenmoser sulfide contraction reaction. In most cases the bicyclic thiazolidinone 5 was produced. Diastereoselective reduction of 2 in the pre...

The synthesis of a set of new N-heteroaryltetramines is reported. A regioselective alkylation on the N-exo nitrogen of pyridinium N-(heteroaryl)aminide with the corresponding tetrabromo compounds, followed by a clean N–N bond reduction of the corresponding tetra-salts, allowed an easy and general method to obtain N,N 0,N00,N000-tetrakis(2-heteroaryl)tetramines. 2007 Elsevier Ltd. All rights res...

Difluorocyclopropanes and difluorocyclopropenes are becoming an important class of compounds in organofluorine chemistry. Introduction of a fluorine atom onto a cyclopropane ring is known to alter the structure and reactivity of the molecule because of the high electronegativity and small size of the fluorine atom, and consequently the increase in the C F bond polarity. Fluorine substituents al...