例句與造句

1. The parent phosphorane ( ? 5 ? 5 ) is PH 5, which is unknown.
2. A two-step " associative " ( addition-elimination or A N + D N ) mechanism that proceeds via a pentavalent phosphorane intermediate.
3. Consistent with this alternative view is the finding that hypercoordinated molecules based on fluorine ligands, for example PF 5 do not have hydride counterparts e . g . phosphorane PH 5 which is unknown.
4. In another example, the phosphorane is produced using sodium amide as a base, and this reagent converts the aldehyde shown into alkene "'I "'in 62 % yield.
5. The stannyl group is replaced by lithium to intermediate "'2 "'which undergoes a phosphate-phosphorane rearrangement to phosphorane "'3 "'which on reaction with acetic acid gives alcohol "'4 " '.
6. It's difficult to find phosphorane in a sentence. 用phosphorane造句挺難的
7. The stannyl group is replaced by lithium to intermediate "'2 "'which undergoes a phosphate-phosphorane rearrangement to phosphorane "'3 "'which on reaction with acetic acid gives alcohol "'4 " '.
8. The Wittig reaction involves reaction of an aldehyde or ketone with a Wittig reagent ( or phosphorane ) of the type Ph 3 P = CHR to produce an alkene and Ph 3 P = O . The Wittig reagent is itself prepared easily from triphenylphosphine and an alkyl halide.