dicyanomethylene造句

• One or both of the oxygen ( = O ) groups in the squarate anion can be replaced by other chalcogenides such as sulfur or other divalent groups, such as dicyanomethylene = C ( CN ) 2.
• The resulting anions, such as 1, 2-bis ( dicyanomethylene ) squarate and 1, 3-bis ( dicyanomethylene ) squarate, retain the aromatic character of squarate and have been called pseudo-oxocarbon anions.
• The resulting anions, such as 1, 2-bis ( dicyanomethylene ) squarate and 1, 3-bis ( dicyanomethylene ) squarate, retain the aromatic character of squarate and have been called pseudo-oxocarbon anions.