Assertion: organic chemistry's reaction | /r/HasAspect | no precedent
Facets:
value: in thermal chemistry
type: OTHER
Source sentences:
text: These additions occur by way of a singlet excited state and are stereospecific: A related reaction, which has no precedent in thermal chemistry, is the cycloaddition of an alkene and an aldehyde or ketone to form an oxacyclobutane: