Asymmetric 1, 3 - dipolar cycloaddition can be strongly catalyzed by chiral oxazaborolidines.手性唑硼烷酮能够催化不对称1, 3偶极加成反应并取得很好的效果.The cycloaddition itself is the slow step.环化作用本身是慢的一步....
She was dumped by her long-term lover after five years.5年后她被相恋多年的恋人抛弃了。Chicago provides a feast for the ears of any music lover.《芝加哥》将给所有音乐爱好者献上一场听觉的盛宴。She has had a flaming row with her lover.她刚和恋人发生了激烈的争吵。...
In 48 cases withcancer after operation, 16 cases decreased in AFP to normal ( 33.33 % ).48例术后带瘤者中16例AFP(甲胎蛋白)降至正常 ( 33.33% ).The accuracy rate in PHCcombining positivity of AFU and AFP was 93.9 %.AFU与AFP联合检测,可使PHC的诊断阳性率提...
她跪了下来,轻吻迈克尔的脸颊。She knelt and brushed her lips softly across Michael's cheek.她走上前拥抱他并轻抚他凌乱的白发。She walked forward and embraced him and stroked his tousled white hair.她把碘酒轻搽在前额的伤口上。She dabbed iodine on the cuts on her ...