01510nas a2200181   4500008004100000022001400041245011800055210006900173260000800242300001400250490000700264520085000271100001701121700002001138700001901158700001901177856013201196       2020                        eng d  a0276-733300aStepwise nucleophilic substitution to access saturated N-heterocyclic carbene haloboranes with boron-methyl bonds0 aStepwise nucleophilic substitution to access saturated Nheterocy  cDEC  a4696-47030 v393 a<p>Compounds of boranes with N-heterocyclic carbenes are known, yet little attention has been paid to NHC compounds of boron bearing methyl and halogen moieties together. The reason can be attributed to the hazardous methyldichloroborane (MeBCl2), which ignites in air. We describe here convenient solution-phase access to SIDipp.MeBCl2 (SIDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) (3) by a salt metathesis reaction of SIDipp.BCl3 (2) with MeLi. Replacement of the chlorine atoms of 3 with stepwise addition of AgOTf led to the formation of SIDipp.MeBCl(OTf) (4) and SIDipp.MeB(OTf)2 (5). In the case of 4, all of the substituents on the boron atom are different. Subsequently, we extended our synthetic approach to the amidinate system and prepared PhC(NtBu)2B(Me)Cl (7) from the reaction of PhC(NtBu)2BCl2 (6) with MeLi.</p>
1 aKundu, Gargi1 aPahar, Sanjukta1 aTothadi, Srinu1 aSen, Sakya, S.  uhttps://library.ncl.res.in/content/stepwise-nucleophilic-substitution-access-saturated-n-heterocyclic-carbene-haloboranes-boron