摘要:

AbstractA reaction between 2, 8‐dichloro‐4, 10‐dinitro‐5, 11‐dehydro‐5H, 11H‐benzotriazolo[2, 1‐a]‐benzotriazole8and sodium azide in dimethyl sulfoxide produced 3, 9‐diazido‐4, 10‐dinitro‐5, 11‐dehydro‐5H, 11H‐benzotriazolo [2, 1‐a]benzotriazole10rather than the 2.8‐diazido isomer9expected by direct displacement. Thermolytic elimination of nitrogen (2 moles) converted the dinitro diazide10to 3,4,9,10‐bisfuroxano‐5, 11‐dehydro‐5H, 11H‐benzotriazolo[2, 1‐a]benzotriazole11that was subsequently nitrated to give the 2,8‐dinitro derivative12. Similar nitration converted the dinitro diazide9to the trinitro15and tetranitro14derivatives: thermolysis of the latter gave 1,2,7,8‐bisfuroxano‐4, 10‐dinitro‐5, 11‐dehydro‐5H, 11H‐benzotriazolo[2, 1‐a]‐benzotriazole16. Nitration (100% HNO3, CF3SO3H) converted compound16to the 3,4,10‐trinitro derivative17, whereas a similar nitration (100% HNO3, FSO3H) gave the title compound BTBB, an insensitive high‐e

ISSN:1042-7163    

DOI:10.1002/hc.520060502

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

Abstract17O NMR data are reported for 10 benzo[d]‐2,2‐difluoro‐1,3,2‐oxoniaoxaboratins derived from various ortho‐hydroxyacetophenones and for 2,2‐difluoro‐1,3,2‐oxoniaoxaboratins derived from related hydroxyacetyl naphthalenes and hydroxybenzophenones. The signal for the carbonyl‐like oxygen for these compounds is substantially shielded and appears at 288 ± 22 δ. The single bonded oxygen signal for the 1,3,2‐oxoniaoxaboratins appears at 122 ± 6 δ, except for the naphthalene analogs, whose signal appears at 146 ± 10 δ. The11B NMR signal for these compounds is insensitive to structural changes and appears at 0.85 ± 0.25 δ.

ISSN:1042-7163    

DOI:10.1002/hc.520060503

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

Abstract3,5‐Diethoxycarbonyl 1,2,4‐diazaphospholes and arsoles undergo N‐alkylation by reaction with alkyl vinyl ether, sulfur ylides, and diazocompounds, owing to the acidity of the NH group. © 1995 John Wiley&Son

ISSN:1042-7163    

DOI:10.1002/hc.520060504

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractPhosphorus trichloride in a basic medium is a convenient reagent for the direct C‐phosphorylation of electron‐rich aromatic heterocycles. The compounds obtained can be used for the synthesis of various types of heteroaryl and diheteroaryl derivatives of tri‐ and pentavalent phosphorus. © 1995 John Wiley&Son

ISSN:1042-7163    

DOI:10.1002/hc.520060505

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractA new method for the synthesis of S‐alkyl methylthiophosphonic acid derivatives is reported. The chlorination of 0,0‐dialkyl methylthiophosphonates8with phosphorus oxychloride proceeds with isomerization of the P=S to the P–S bond to give S‐alkyl methylthiophosphonochloridates9, which react further with various nucleophiles in the presence of triethylamine to afford S‐alkyl methylthiophosphonic acid derivatives10. Among them, several compounds10show excellent fungicidal or insecticidal activities. © 1995 John Wiley

ISSN:1042-7163    

DOI:10.1002/hc.520060506

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractThe reaction of phosphorus(III) halides with imidazo[1,2‐a]pyridines in the presence of bases leads to the formation of 3‐phosphorylated imidazo[1,2‐a]pyridines. The reaction proceeds in high yield and requires no catalysts.In the compounds obtained, in contrast to phosphorylated indolizines, the phosphorus–heterocycle bond is stable and not cleaved by dry hydrogen chloride, alcohols, or water.Imidazo[1,2‐a]pyridines with the phosphinic and phosphinous groups can be alkylated both at the phosphorus and at the nitrogen atom of the heterocycle, the alkylation direction being dependent on the strength of the alkylation reagent used. © 1995 John Wiley

ISSN:1042-7163    

DOI:10.1002/hc.520060507

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractA series of previously unknown α‐guanidinoalkanephosphonous, α‐ and β‐guanidinoalkanephosphonic acids has been prepared in order to study their structures and biological activity. Aminoalkanephosphonous and phosphonic acids have been converted into their guanidino derivatives by means of S‐methylisothiourea hydroiodide or cyanamide amidination. The crystal and molecular structures of three guanidino acids have been determined by single‐crystal X‐ray diffraction. The plant growth regulating activity of all synthesized guanidinoalkanephosphinates and phosphonates has been evaluated on Lepidium sativum. © 1995 John

ISSN:1042-7163    

DOI:10.1002/hc.520060508

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractNine substituted benzoyl hydrazonyl, three semicarbazonyl, and four thiosemicarbazonyl tridentate ligands were synthesized. They were used to coordinate with Bu2SnCl2or (PhCH2)2SnCl2to form 18 novel tin complexes that contained pentacoordinate organotin(IV) in a heterobicyclic ring. All these complexes were characterized by MS, NMR, and IR spectroscopy elemental analyses. © 1995 John Wiley&Sons, Inc

ISSN:1042-7163    

DOI:10.1002/hc.520060509

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractThe reactions of N‐methyl‐ and N‐phenylpyrazole derivatives with phosphorus(III) halides have been studied. The preparative method for synthesis of a variety of 4‐phosphorylated pyrazoles, including pyrazolyl substituted halo‐ and dihalophosphines, has been elaborated. Migration of an alkyl group from O to P(III) in 4‐phosphorylated 5‐alkoxypyrazoles was found to give a P‐ylides in a vinylogous manner with respect to the Arbuzov reaction. © 1995 John

ISSN:1042-7163    

DOI:10.1002/hc.520060510

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY

摘要:

AbstractCo‐pyrolytic gas phase reactions of 1,2‐dimethyl‐1,1,2,2‐tetra‐(methoxy)disilane with conjugated 1‐oxatrienes in a flow‐reactor furnish, via intermediate methoxymethylsilylene, mixtures of diastereoisomers of 3‐phenyl‐1‐oxa‐2‐silacyclohepta‐4,6‐dienes and 3‐styryl‐1‐oxa‐2‐silacyclopent‐4‐enes, usually including smaller amounts of the corresponding 1‐oxa‐2‐silacy‐clopent‐3‐ene isomers. In co‐pyrolysis with an analogous N‐isopropylazatriene, five‐membered rings were formed preferentially, and seven‐membered isomers could not

ISSN:1042-7163    

DOI:10.1002/hc.520060511

出版商:VCH Publishers, Inc.    

年代:1995

数据来源: WILEY