Cyclopropylmagnesium bromide

The square pyramidal complexes of group 9 iridium cyclopropylbis(>/4-diene) complexes were recently synthesized in poor yields (3-5%) by metathesis reaction between (tf-diene)2 IrCl and cyclopropyllithium or cyclopropylmagnesium bromide (equation 16)45. 

Similarly, group 10 trigonal nickel complex Cp(PPh3)Ni(c-Pr) was prepared from Cp(PPh3)NiCl and cyclopropylmagnesium bromide". This complex, in analogy with the... 

The reverse photoreaction, i.e. the photocyclization of cinnamylmagnesium bromide to the corresponding cyclopropylmagnesium bromide, has also been described ... 

Cyclopropylmagnesium Bromide Product Balances, Calculated and Found... 

Table 17 Yields of Cyclopropane Formed Directly During Formation of Cyclopropylmagnesium Bromide in the Reaction of Cyclopropane with Magnesium...

By converting cyclopropyllithium intermediates to cyclopropylmagnesium bromide species and subsequent addition of approximately 1% of a nickel catalyst, [l,2-bis(diphenylphosphino)-ethane]nickel dichloride [Ni(dppe)Cl2], the tricyclo[4.1.0.0 ]hept-l-yl and similar anions were... 

Cyclopropylmagnesium bromide is reactive enough to transform esters to the corresponding tertiary alcohols, albeit in moderate yields only. This has been utilized in a couple of cases. Thus, when ethyl diphenylacetate and methyl dicyclopropylacetate were used as electrophiles, l,l-dicyclopropyl-2,2-diphenylethanol (6) and 1,1,2,2-tetracyclopropylethanol (7), spectively, were both isolated in less than 50% yield. 

A limited number of bromocyclopropanes have been converted to a variety of functionalized alkenes with the ring attached to the C-C double bond. With the exception of an iron-mediated substitution of cyclopropylmagnesium bromide to bromomethylenecyclopropane, which leads... 

The reaction of diarylcyclopropenones 1 with aryl- or cyclopropylmagnesium °° bromide and hydrolysis using aqueous potassium dihydrogen phosphate solution, followed by treatment with a strong Bronsted acid such as tetrafluoroboric - or hydrobromic acid, afforded the trisubstituted cyclopropenylium salts 26. 

The unusual cyclopropane 551 was isolated [probably as the (5)-isomer] from Pistacia vera, together with the hydrated analog 552 551 was synthesized by Grignard reaction of cyclopropylmagnesium bromide with 4-methyl-3-cyclohexenone, and the diol 552 by lithium aluminum reduction of the epoxide of 551. ... 

Tricyclopropylbismuth and dicyclopropylbismuth chloride are obtained by reaction of cyclopropylmagnesium bromide with Bids according to the required stoichiometry. These organobismuth compounds are useful for iV-cyclopropylation of lactams such as phenanthridinone. ... 

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