نتایج جستجو برای: protecting group

تعداد نتایج: 1006342  

2011
B. P. Bandgar S. N. Kinkar

In recent years much effort has been carried out on formylations of amines. N-formyl compounds have been widely used in organic synthesis as protecting group of amines [1]. They are also used for synthesis of pharmaceutically important heterocylces [2-5]. Formamides are the Lewis bases, which are known to catalyze reactions such as allylations [6] and hydrosilylations [7] of carbonyl compounds....

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1381

‏‎this study investigated the effect of prior knowledge on the listening comprehension performance of fl learners. twenty students, male and female, drawn from the two intact groups of the senior and junior english language and literature majors were chosen as the participants of this study . the two groups were then randomly assigned into the experimental and control group. the experimental gr...

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