Thaumarchaeota also synthesise a regio-isomer of crenarchaeol.
In addition to high-order polymers and dimers and trimers, which originate from low regio- and chemoselectivities, enyne side products derived from alkyne dimerization have been observed.
Because this is a higher-order cycloaddition, issues of periselectivity arise in addition to the usual concerns about regio- and stereoselectivity.
H followed by acid hydrolysis completes the synthesis of cypenamine with excellent regio and stereospecificity.
It is a candidate for a monastic site or a royal regio (estate).
The addition can be done highly regio- and stereo-selectively, the choices of metal centers, ligands, substrates and counterions often play very important role.
The maxim of "cuius regio, eius religio" (whose region, his religion) meant that subjects had to adopt the faith of their rulers.
Regio trains operate mostly on local routes and stop at every station.
