摘要:

AbstractSeveral 1‐aminothialkanephosphonic acids2were synthesized and selectively oxidized to their sulfinyl3and sulfonyl4derivatives. For the compounds2,3, and4, their dissociation properties were determined potentiometricall

ISSN:1042-7163    

DOI:10.1002/hc.520050102

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractAllyldialkyltelluronium bromides were treated with aromatic amines in 1,2‐dichloroethane, readily giving allyl aryl amines in excellent yield

ISSN:1042-7163    

DOI:10.1002/hc.520050103

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractPhenyliodonium bis(perfluoroalkanesulfonyl) methides PhI+−C(SO2RF)2(3) were prepared by the reaction of bis(perfluoroalkanesulfonyl)methanes with diacetoxyiodobenzene. The photochemical reactions of3with alkenes, methanol, bromine, and benzene gave the corresponding addition or insertion products. When3was irradiated in the presence of methyl sulfide, pyridine, and triphenylphosphine, it afforded the ylides containing the bis(perfluoroalkanesulfonyl)methylene functionality, Y+−C(SO2RF)2. In these reactions the bis(perfluoroalkanesulfonyl)carbene intermediate (RFSO2)2C: may be involved. Irradiation or heating of3in DMSO gave a 1 : 1 complex, the structure of which was confirmed by X‐ray diffraction analysis. Bis(perfluoroalkanesulfonyl)‐methylene dimethyloxosulfonium ylides Me2(O)S+−C(SO2RF)2were obtained by air oxidation of bis(perfluoroalkanesulfonyl)methylene dimethyls

ISSN:1042-7163    

DOI:10.1002/hc.520050104

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractTetrasulfurtetranitride, S4N4reacts with (2‐pyridylamino)‐diphenylphosphine in MeCN at room temperature to form the cyclotrithiazene (NC5H4NH)‐Ph2PNS3N3(1) in good yield. By contrast, the cyclophosphathiazenes Ph2PS2N3(2) and 1,5(Ph2P)2S2N4(3) are isolated from the same reaction mixture under reflux conditions. In solution, compound1is found to be transformed into2. The reaction of S4N4with (2‐pyridylamino)phenyl(dicyclohexylamino)phosphine in MeCN at room temperature affords Ph(DCA)PS2N3(4) (DCA = dicylohexylamino) as the only reaction product. This on treatment with norbornadiene produces the addition product Ph(DCA)PS2N3·C7H8(5).The structure of4has been established by X‐ray diffraction. Its PSN ring adopts a skew boat conformation with SN bond lengths varying from 1.574(4) to 1.606(4) Å. The mean value of the endocyclic PN bonds amou

ISSN:1042-7163    

DOI:10.1002/hc.520050105

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

Abstract2, 4‐Bis‐(4‐methoxyphenyl)‐1, 3, 2, 4‐dithiadiphosphetane‐2, 4‐disulfide [Lawesson reagent (LR)]1reacts with p‐quinone monoimine‐2ato give the novel benzo‐1,3,2‐oxathiaphosphol‐5‐(methanesulfonamido)‐2‐(4‐methoxyphenyl)‐2‐sulfide4. On the other hand, the reaction of2band3with LR1leads to the formation of the benzo‐ and the naphtho‐1,3,2‐dithiaphosphol‐5 ‐(benzenesulfonamido)‐ 2‐ (4‐methoxyphenyl) ‐2‐sulfide5,6. Thiation of2a,2b, and3with P4S10yields phenoxathiin derivatives8a,8b, and9, respectively. The identity of the new products is

ISSN:1042-7163    

DOI:10.1002/hc.520050106

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractReactions of SeCl4with lithium bis(trimethylsilyl)amide and terminal acetylenes in the presence of BuLi or AIBN afforded the corresponding dialkynyl selenides in moderate to high yields. The reaction may proceed via a selenium amide7and an alkynyl selenium amide8. The comparison of13C NMR spectra of dialkynyl selenides and tellurides has disclosed that the differences of the chemical shift of acetylenic carbons between Se and Te derivatives are consistent regardless of their substitution patterns. Ab initio molecular orbital calculations are reported for dialkynyl ether and chalcogenides. The calculated structures, charge distributions, and orbital energies are discussed.

ISSN:1042-7163    

DOI:10.1002/hc.520050107

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractFused 1,3‐benzothiaphospholes2(cis‐2,6,10‐trimethyl‐[1, 3]benzothiaphospholo[2,3‐b][1, 3]benzothiaphosphole) reacts with H2O2and S8, giving the corresponding oxide and sulfide, respectively. The reactions of2with diethyl azodicarboxylate (DEAD)/catechol or DEAD/o‐aminophenol, o‐azidophenol, and tetrachloro‐o‐benzoquinone (TOB) give the first examples of spiro pentacoordinated phosphorus derivatives of this heterocyclic system. The X‐ray structural analysis of spiro compound3showed a trigonal bipyramidal configuration at phosphorus in which the three rings assume axial

ISSN:1042-7163    

DOI:10.1002/hc.520050108

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractThe crystal structure of 5,6‐benzo‐4‐diphenylphosphino‐2‐phenyl‐1,3,2‐dioxaborinane1indicates the occurrence of an interaction between the π‐systems of the 1,3,2‐dioxaborinane ring and the appropriate phenyl group of the diphenylphosphino group. Complexes of compound1with PtCl2, PdCl2, and Cul were synthesized. Compound1and its complexes are readily hydrolyzed in solution to give diphenylphosphine and its correspondi

ISSN:1042-7163    

DOI:10.1002/hc.520050109

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractStereospecific ring openings of optically active 2,3‐epoxy alcohols were performed by the reaction of1,3,5, and7with carbon disulfide and sodium hydride to give the five‐membered xanthates2,4,6, and8. Both enantiomers of 2‐mercapto‐1,3‐diol triacetates,11and14, were derived from4and6, respectively. The ring opening reaction proceeded at −78°C to −30°C, and the yields were around 80%. However, at a higher temperature between 0°C to room temperature, a complicated reaction took place and led to the formation of two isomers of the cyclic thiol carbonates15and16from1or5. These processes were also stereospecific, and mechanisms have been proposed. In the case of the 3,4‐epoxy alcohol20, the epoxide ring opening gave the six‐membered xanthate

ISSN:1042-7163    

DOI:10.1002/hc.520050110

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY

摘要:

AbstractThe structure‐generating feature of the computer program RAIN (reactions and intermediates networks) was used to produce the complete set of 48 conceivable B6H14isomers with twofold constitutional symmetry. The constitutional isomers are built from BH units and contain up to two closed BBB three‐center bo

ISSN:1042-7163    

DOI:10.1002/hc.520050111

出版商:VCH Publishers, Inc.    

年代:1994

数据来源: WILEY