The remarkable role of steric factors in the reactions of alkynes (HCCH and MeCCMe)with ditungsten hexa-alkoxides: crystal and molecular structures of W<sub>2</sub>(OPr<sup>i</sup>)<sub>6</sub>(py)<sub>2</sub>(µ-C<sub>2</sub>H<sub>2</sub>), W<sub>2</sub>(OCH<sub>2</sub>Bu<sup>t</sup>)<sub>6</sub>(py)<sub>2</sub>(µ-C<sub>2</sub>Me<sub>2</sub>), and W<sub>2</sub>(OPr<sup>i</sup>)<sub>6</sub>(µ-C<sub>4</sub>R<sub>4</sub>)(C<sub>2</sub>R<sub>2</sub>), where R = H and Me (py = pyridine)
作者:Malcolm H. Chisholm、Kirsten Folting、David M. Hoffman、John C. Huffman、Joseph Leonelli
DOI:10.1039/c39830000589
日期:——
Ethyne and but-2-yne react with hydrocarbon solutions of W2(OR)6 compounds in the presence of pyridine (py) to produce the compounds W2(OR)6(py)2(µ-C2R′2), W2(OR)6(η-C4R′4)(C2R′2), or R′CW(OR)3, depending on the nature of the alkoxy group and the alkyne substituent, R′
Metal alkoxides models for metal oxides. 5. Coupling of alkyne ligands in reactions involving ditungsten hexaalkoxides: an alternative to the metathesis reaction M.tplbond.M + C.tplbond.C- .fwdarw. 2M.tplbond.C
作者:Malcolm H. Chisholm、David M. Hoffman、John C. Huffman
DOI:10.1021/ja00334a056
日期:1984.10
The C-C couplingreactionsinvolving W/sub 2/(..mu..-C/sub 2/R/sub 2/) compounds in the reactions with alkynes and nitriles have been studied. Results of crystal structure, molecular structure, and NMR studies are reported. A comparison of the reactions of this type of compounds with that of Mo/sub 2/(OR)/sub 2/ is made, but the C-C couplingreaction is not noted for the Mo compound.
已经研究了涉及 W/sub 2/(..mu..-C/sub 2/R/sub 2/) 化合物与炔烃和腈反应的 CC 偶联反应。报告了晶体结构、分子结构和核磁共振研究的结果。对这类化合物的反应与 Mo/sub 2/(OR)/sub 2/ 的反应进行了比较,但没有注意到 Mo 化合物的 CC 偶联反应。
Coupling CC, CN, and WW bonds. Preparation, and crystal and molecular structure of hexaneopentoxy(pyridine)[2-amido(2–)-W<sup>1</sup>,W<sup>1</sup>-5-amido(2–)-W<sup>2</sup>-3,4-dimethylhexa-2,4-diene]ditungsten W<sub>2</sub>(OCH<sub>2</sub>Bu<sup>t</sup>)<sub>6–</sub>(py)(N[CMe]<sub>4</sub>N)
作者:Malcolm H. Chisholm、David M. Hoffman、John C. Huffman
DOI:10.1039/c39830000967
日期:——
In a sequential reaction, W2(OCH2But)6(py)2(Wz.tbd6;W) reacts in hydrocarbon solvents at room temperature with (i )but-2-ene(1 equiv.) and (ii) acetonitrile( 2equiv.) to yield W2(OCH2But)6(py)(N[CMe]4N)(W–W), a novel dinuclearcompound containing a ligand which may be considered to be the 4– anion derived from 1,4-diamino-1,2,3,4-tetramethylbuta-1,3-diene
在顺序反应中,W 2(OCH 2 Bu t)6(py)2(W z.tbd6; W)在室温下在烃类溶剂中与(i)丁-2-烯(1当量)和(ii)反应)乙腈(2当量)生成W 2(OCH 2 Bu t)6(py)(N [CMe] 4 N)(W – W),这是一种新型的含有配体的双核化合物,该配体可以被认为是4–阴离子衍生自1,4-二氨基-1,2,3,4-四甲基丁-1,3-二烯
Chisholm, Malcolm H.; Folting, Kirsten; Klang, Jeffrey A., Organometallics, 1990, vol. 9, # 3, p. 607 - 613
作者:Chisholm, Malcolm H.、Folting, Kirsten、Klang, Jeffrey A.
DOI:——
日期:——
Metal alkoxides: models for metal oxides. 4. Alkyne adducts of ditungsten hexaalkoxides and evidence for an equilibrium between dimetallatetrahedrane and methylidynemetal complexes: W2(.mu.-C2H2) .dblharw. 2W.tplbond.CH
作者:Malcolm H. Chisholm、Kirsten Folting、David M. Hoffman、John C. Huffman