| 1. | Such a helerocycle is found in pyrylium salts .
吡喃盐就是这类的杂环。 |
| 2. | Pyran is not aromatic, but the phrylium ion is .
吡喃不是芳香的，但英嗡离子是。 |
| 3. | Such is the case in pyrrole, thiophene, and furan .
吡咯，噻酚和呋喃的情况就是这样。 |
| 4. | Such is the case in pyrrole, thiophene, and furan .
吡咯、噻酚和呋喃的情况就是这样。 |
| 5. | Evidence from case histories suggests that pyridoxine levels could be increased .
过去的记载提出吡哆醇的水平可以提高。 |
| 6. | Non-basic nitrogen-containing series include pyrroles, indoles, carbazoles and benzcarbazoles .
不含碱性氮的化合物包括吡咯、吲哚、咔唑和苯咔唑。 |
| 7. | The pyridine was chemisorbed at both lewis and bronsted sites on the glass surface .
在玻璃表面上，吡定都是化学地吸收在路易斯和布朗斯特德位置上的。 |
| 8. | The stereospecificity of the thermal cleavage of pyrazolines is lacking although stereoselectivity does exist .
二氢吡唑热解虽然有立体选择性，但没有立体定向性。 |
| 9. | Treatments of pyrylium salts with various nucleophilic reagents allows the production of a host of functionalized derivatives .
如果各种亲核试剂与吡喃盐反应，就可制取许多种带官能基的衍生物。 |
| 10. | Scheme 1 . condensation of pyrrole and benzaldehyde
图式1吡咯与苯甲醛的缩合反应。 |
