Alternating ring-opening metathesis polymerization

A polymer comprising the repeating unit (Ib) or (Ic):

• wherein R is selected from the group consisting of H, C1-C20 alkyl, C2-C20 alkenyl, C3-C8 cycloalkyl, heterocyclyl, aryl, C1-C20 alkoxy, C1-C20 alkenyloxy, C3-C6 cycloalkyloxy, aryloxy, heterocyclyloxy, C1-C20 alkylamino, C1-C20 alkenylamino, C3-C8 cycloalkylamino, heterocyclylamino, or arylamino and may be optionally substituted with up to three substituents selected from halo, CN, NO2, oxo, alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, and a heterocyclic group;
• n is a number between 2 and 20;
• R1 through R6 are independently selected from the group consisting of H, aldehyde, C1-C20 alkyl, C2-C20 alkenyl, C3-C6 cycloalkyl, aryl, heterocyclyl, C1-C20 alkoxy, C1-C20 acyloxy, C2-C20 alkenyloxy, C3-C6 cycloalkyloxy, aryloxy, heterocyclyloxy, C1-C20 alkylamino, C2-C20 alkenylamino, C3-C8 cycloalkylamino, heterocyclylamino, arylamino, or halogen;
• R1 through R6 may be taken together to form a 5- to 7-membered ring which may be optionally substituted with up to three substituents selected from halo, CN, NO2, oxo, alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, or a heterocyclic group;
• A is a C2-C20 alkyl;
• with the proviso that any carbon-carbon double bonds in R or in R1 through R6 are essentially unreactive toward metathesis reactions with the catalyst.