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Synthesis of Molybdenum Imido 2-Adamantylidene Complexes through α Hydrogen Abstraction
Organometallics ( IF 2.5 ) Pub Date : 2020-06-08 , DOI: 10.1021/acs.organomet.0c00244
Jordan W. Taylor 1 , Richard R. Schrock 1 , Charlene Tsay 1
Affiliation  

Addition of 2-adamantylMgBr in diethyl ether to Mo(NAr)2(Cl)2(DME) (Ar = 2,6-i-Pr2C6H3) gave Mo(NAr)2(2-Ad)2 (2-Ad = 2-adamantyl, DME = 1,2-dimethoxyethane), from which Mo(NAr)(Adene)(OTf)2(DME) (1, Adene = 2-adamantylidene) was prepared upon addition of triflic acid. Methods analogous to those that have been successful for synthesizing neopentylidene and neophylidene complexes were used to form Mo(NAr)(Adene)(OMes)2 (2; Mes = 2,4,6-trimethylphenyl), [Mo(NAr)(Adene)(OC6F5)2]2 (3), Mo(NAr)(Adene)(OC6F5)2(MeCN) (4), Mo(NAr)(Adene)(Cl)2(bipy) (5; bipy = 2,2′-bipyridine), Mo(NAr)(Adene)(Cl)(OHMT) (6; OHMT = O-2,6-Mesityl2C6H3), Mo(NAr)(Adene)(Cl)(OHMT)(t-BuCN) (6(t-BuCN)), and Mo(NAr)(Adene)(OHMT)(Pyr) (7; Pyr = pyrrolide). Analogous methods beginning with Mo(N-t-Bu)2(2-Ad)2 yielded Mo(N-t-Bu)(Adene)(Cl)2(bipy) (8a), Mo(N-t-Bu)(Adene)(Cl)(OHMT)(THF) (8b), Mo(N-t-Bu)(Adene)(Cl)(OHMT)(t-BuCN) (8c), and Mo(N-t-Bu)(Adene)(OHMT)(Pyr)(THF) (8d). X-ray structural studies of 1-5, 6(t-BuCN), 7, 8a, 8c, and 8d suggest that one of the Adene β protons is engaged in an agostic interaction with the metal when the electron count is less than 18. Preliminary olefin metathesis studies confirm that Adene complexes react with cyclooctene and 1-decene in the manner expected for high-oxidation-state Mo alkylidene complexes.

中文翻译:

α氢提取法合成亚氨基钼亚甲基2-金亚烷基配合物

将在乙醚中的2-金刚烷基MgBr加到Mo(NAr)2(Cl)2(DME)(Ar = 2,6- i -Pr 2 C 6 H 3)中,得到Mo(NAr)2(2-Ad)2( 2-Ad = 2-金刚烷基,DME = 1,2-二甲氧基乙烷),通过加入三氟甲磺酸制备了Mo(NAr)(Adene)(OTf)2(DME)(1,Adene = 2-金刚烷)。使用类似于已成功合成新亚戊二烯和新戊二烯配合物的方法形成Mo(NAr)(Adene)(OMes)22 ; Mes = 2,4,6-三甲基苯基),[Mo(NAr)(Adene )(OC 6 F 52 ] 23),Mo(NAr)(Adene)(OC 6 F 52(MeCN)(4),Mo(NAr)(Adene)(Cl)2(bipy)(5 ; bipy = 2,2 ′-联吡啶),Mo(NAr)(Adene)(Cl)(OHMT)(6 ; OHMT = O-2,6-Mesityl 2 C 6 H 3),Mo(NAr)(Adene)(Cl)(OHMT) (t -BuCN)(6t -BuCN))和Mo(NAr)(Adene)(OHMT)(Pyr)(7 ; Pyr =吡咯化物)。以Mo(N- t- Bu)2(2-Ad)2开头的类似方法产生Mo(N- t-Bu)(ADENE)(CL)2(联吡啶)(图8a),MO(N--Bu)(ADENE)(CL)(OHMT)(THF)(图8b),MO(N--Bu)( Adene)(Cl)(OHMT)(t- BuCN)(8c)和Mo(N- t- Bu)(Adene)(OHMT)(Pyr)(THF)(8d)。透视的结构研究1 - 56-BuCN),7图8A图8C,和图8D 提示当电子数小于18时,一个Adeneβ质子会与金属发生有害相互作用。初步的烯烃复分解研究证实,Adene络合物可与环辛烯和1-癸烯发生高氧化反应,态Mo亚烷基络合物。
更新日期:2020-06-23
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