## Wikipedia - Regioselectividad (es) Wikipedia - Regioselektywność (pl) Wikipedia - Regioselettività (it) Wikipedia - Regiosseletividade (pt) Wikipedia - Selektiivisyys (fi) Wikipedia - Selettività (chimica) (it) Wikipedia - Региоселективность (ru) Wikipedia - انتقائية موضعية (ar) regioselectivity (regioselective)

https://doi.org/10.1351/goldbook.R05243
A regioselective reaction is one in which one direction of bond making or breaking occurs preferentially over all other possible directions. Reactions are termed completely (100%) regioselective if the discrimination is complete, or partially (x%), if the product of reaction at one site predominates over the product of reaction at other sites. The discrimination may also semi-quantitatively be referred to as high or low regioselectivity. (Originally the term was restricted to @[email protected] reactions of unsymmetrical reagents to unsymmetrical @[email protected]) In the past, the term 'regiospecificity' was proposed for 100% regioselectivity. This terminology is not recommended owing to inconsistency with the terms @[email protected] and @[email protected]