Assertion: mustard gas | /r/HasAspect | central lewis base
Facets:
value: generally
type: DEGREE
Source sentences:
text: Both mustard gas and the related amine gas weapons generally have a central Lewis base (electron donor), either an atom or a group, that can undergo nucleophilic attack of the terminal halogenated carbon(s) to form a cyclic cation (phosphonium, ammonium, or oxonium) with subsequent release of a halogen ion.