Herberich, Gerhard E. published the artcileBis(boryl)metallocenes. 2. Syntheses of 1,1′-Bis(boryl)cobaltocenium Complexes, Name: Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Organometallics (1998), 17(22), 4769-4775, database is CAplus.
Bis(boryl)cobaltocenes Co(C5H4BR2)2 (1) can be made from CoBr2(DME) and alkali metal borylcyclopentadienides M(C5H4BR2) (M = Li, Na) (2). The two dialkylamino compounds 1c (R = NMe2) and 1d (R = NEt2) can be obtained in this way. Oxidation with C2Cl6 provides the ionic cobaltocenium chlorides (1c)Cl and (1d)Cl. Further cobaltocenium compounds can be synthesized by modification of the substituents at B. Treatment of (1d)Cl with excess BCl3 affords the highly reactive chloride Co(C5H4BCl2)(C5H4BCl3) (5). Pinacolysis of 5 then affords the monosubstitution product Co[C5H4B(OCMe2)2](C5H4BCl3) (9) and the disubstitution product [Co{C5H4B(OCMe2)2}2]Cl [(1h)Cl], resp., depending on stoichiometry and reaction conditions. Reaction of 5 with tetramethyltin replaces two Cl atoms with Me groups to give Co(C5H4BMe2)(C5H4BCl3) (10), while the more reactive trimethylaluminum replaces four Cl substituents to give [Co(C5H4BMe2)2]AlCl4 [(1b)AlCl4] and, after metathesis with NBu4PF6 in CH2Cl2, the more convenient hexafluorophosphate (1b)PF6. The corresponding cobaltocene 1b is then accessible via conventional amalgam reduction of (1b)AlCl4. Reaction of 5 with com. AsF3 affords the robust inverse chelate Co(C5H4BF2)2(μ-OH) (11). Three structural types are encountered for the cobaltocenium derivatives: (i) ionic compounds (type A) such as (1c,d,h)Cl, (1b)AlCl4, and (1b)PF6; (ii) zwitterionic or semiquaternized compounds (type B) with one trigonal and one tetrahedral B center such as 5, 9, and 10; of these, 5 is fluxional in solution with two effectively equivalent ligands while 9 and 10 display static structures; and (iii) the inverse chelate structure of 11 (type C) which is found in the crystal and in solution The crystal and mol. structures of 11 were determined by x-ray crystallog.
Organometallics published new progress about 18346-57-1. 18346-57-1 belongs to bromides-buliding-blocks, auxiliary class Cobalt, name is Cobalt(II) dibromo(1,2-dimethoxyethane), and the molecular formula is C4H10Br2CoO2, Name: Cobalt(II) dibromo(1,2-dimethoxyethane).
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary