نتایج جستجو برای: Trans-thioacetalization
تعداد نتایج: 65652 فیلتر نتایج به سال:
nano-silica supported boron trifluoride (bf3.sio2) is an efficient, reusable and eco-friendly catalyst for chemoselective thioacetalization of aldehydes and ketones. so, this catalyst was applied for transthioacetalization of acetals and acylals into their corresponding 1,3-dithiolanes or 1,3-dithianes in good to excellent yields. the reactions were carried out at room temperature under solven...
Nano-silica supported boron trifluoride (BF3.SiO2) is an efficient, reusable and eco-friendly catalyst for chemoselective thioacetalization of aldehydes and ketones. So, this catalyst was applied for transthioacetalization of acetals and acylals into their corresponding 1,3-dithiolanes or 1,3-dithianes in good to excellent yields. The reactions were carried out at room temperature under solven...
Nano-silica supported boron trifluoride (BF3.SiO2) is an efficient, reusable and eco-friendly catalyst for chemoselective thioacetalization of aldehydes and ketones. So, this catalyst was applied for transthioacetalization of acetals and acylals into their corresponding 1,3-dithiolanes or 1,3-dithianes in good to excellent yields. The reactions were carried out at room temperature under solven...
We report here the first catalytic asymmetric thioacetalization of salicylaldehyde and dithiol. Chiral phosphoric acid STRIP C5 is identified as a powerful catalyst for this reaction to afford various chiral dithioacetals in high to excellent yields and enantioselectivities under mild conditions.
selective desulfurization of thiocarbonyls to carbonyls thioacetalization of aldehydes and ketones a useful reagent system for the dethioacetalization reactions
An attempt to synthesize the cyclohexane core of antibiotic abyssomicin C is described. The initial, protecting group-free approach (relying on internal protection) failed and had be modified, in order allow for efficient deprotection acid-sensitive cyclization precursor penultimate synthetic step. Thus, a pyranoside structural unit was used as latent lactone/ester functionality, which deprotec...
فن آوری اطلاعات در دهه های اخیر تمام ابعاد زندگی بشر را تحت تاثیر قرار داده و در این میان صنعت بانکداری نیز تحول معنی داری را تجربه کرده است. بدیهی است کاربرد بانکداری الکترونیکی زمانی مفید ارزیابی می شود که سودآوری بانکها را افزایش دهد.این پژوهش درصدد است با در نظر گرفتن 10بانک اقتصاد نوین، تجارت، پارسیان، پاسارگاد، سامان، سپه، سینا، صادرات، ملت و ملی طی سالهای 1386تا 1389 و بر اساس مدل داده ه...
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