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1、
Two new derivatives of 4 - dicyanomethylene - 2 , 6 - dimethyl - 4 H - pyran and the corresponding poly ( amic acid ) were synthesized and characterized.
两种新的 4- 二氰亚甲基 -2, 6- 二甲基 -4H- 吡喃衍生物及对应的聚酰胺酸被合成和表征.
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2、
The active ingredient of α - pyrone 0.2 % wettable powder is 5,6 - dihydro - 6 - pentyl - 2 H - pyran - 2 - one.
0.2%α - 吡喃酮WP的 有效成分为5, 6- 二氢-6-戊基-2H-吡喃 -2- 酮(5, 6-dihydro-6-pentyl-2H-pyran-2-one ).
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3、
Pyran is not aromatic, but the phrylium ion is.
吡喃不是芳香的, 但眬英嗡离子是.
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