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Silyl-Gruppen sind die einzigen Schutzgruppen, welche durch Fluoridionen gespalten werden.
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A modified procedure using catalytic fluoride in anhydrous dimethyl sulfoxide-methanol generates primarily volatile silicon byproducts.

DiLauro, W. Seo, S. Phillips, J. Various tert -butyldimethylsilyl ethers are easily removed in excellent yields by treatment with a catalytic amount of N -iodosuccinimide in methanol.

Karimi, A. Zamani, D. Zarayee, Tetrahedron Lett. The supported catalyst and the solvent can be readily recovered and recycled.

Kumar, S. Baskaran, J. A chemoselective, efficient and operationally simple desilylation of O-tert -butyldimethylsilyl ethers was achieved using chlorotrimethylsilane and potassium fluoride dihydrate in acetonitrile.

Peng, W. Li, Synlett , , A microwave-assisted, chemoselective and efficient method for the cleavage of silyl ethers is catalyzed by Selectfluor.

In addition, the transetherification and etherification of benzylic hydroxy groups in alcoholic solvents is observed.

Shah, S. Singh, P. Guiry, J. Carboxylic esters, labile phenolic acetates and TBDMS ethers of benzylic alcohols were unaffected under these conditions.

Lakshman, F. Tine, T. Khandaker, V. Basava, N. Agyemang, M. Benavidez, M. Guerrera, B. Zajc, Synlett , , 28 , Wang, H.

Sun, Z. Sun, J. With either 1. A direct transformation of aryl silyl ethers into biaryl ethers was possible through tandem desilylation and S N Ar reaction with activated aryl fluorides.

Yeom, H. Kim, S. Lee, B. Kim, Synlett , , Barnych, J. Zhang, L. Xu, M. In both cases, automatic reformatting destroys the original spacing, but automatic line indenting will work properly.

Steve McConnell , in his book Code Complete , advises against using this style: he marks a code sample which uses it with a "Coding Horror" icon, symbolizing especially dangerous code, and states that it impedes readability.

Horstmann adapts Allman by placing the first statement of a block on the same line as the opening brace. However, the edition now uses Allman style throughout.

This is the style used most commonly in the language Pico by its designers. Pico lacks return statements, and uses semicolons as statement separators instead of terminators.

It yields this syntax: [30]. In the book Programmers at Work , [31] C. Wayne Ratliff discussed using the style below.

The style begins much like 1TBS but then the closing brace lines up with the indentation of the nested block. He indicated that it was originally documented in material from Digital Research Inc.

This style has sometimes been termed banner style, [32] possibly for the resemblance to a banner hanging from a pole. Kernighan and Plauger use this style in the Ratfor code in Software Tools.

A programmer may even go as far as to insert closing braces in the last line of a block. This style makes indentation the only way to distinguish blocks of code, but has the advantage of containing no uninformative lines.

This could easily be called the Lisp style because this style is very common in Lisp code or the Python style Python has no braces, but the layout is very similar, as shown in the code blocks below.

In Python, layout is a part of the language, called the off-side rule. Haskell layout can make the placement of braces optional, although braces and semicolons are allowed in the language.

In Haskell, layout can replace braces. Usually the braces and semicolons are omitted for procedural do sections and the program text in general, but the style is commonly used for lists, records and other syntactic elements made up of some pair of parentheses or braces, which are separated with commas or semicolons.

In some situations, there is a risk of losing track of block boundaries. This is often seen in large sections of code containing many compound statements nested to many levels of indentations.

By the time the programmer scrolls to the bottom of a huge set of nested statements, they may have lost track of which control statements go where.

However, overly-long code could have other causes, such as being too complex , and a programmer facing this problem might instead consider whether code refactoring would help in the longer term.

To avoid losing track of control statements such as for , a large indentation can be used, such as an 8-unit-wide hard tab, along with breaking up large functions into smaller and more readable functions.

The cursor then jumps to the opposing brace. Since the text cursor's next key viz. Another solution is implemented in a folding editor , which can hide or reveal blocks of code via their indentation level or compound-statement structure.

Many editors will also highlight matching brackets or braces when the cursor is positioned next to one. A statement mistakenly inserted between the control statement and the opening brace of the loop block turns the body of the loop into a single trip.

From Wikipedia, the free encyclopedia. Redirected from Indent style. Main article: GNU coding standards.

Retrieved 6 June Retrieved 9 July Communications of the ACM. Retrieved 3 August Retrieved 18 August Checking C programs with Lint.

California: O'Reilly and Assosciates. Retrieved 8 November Sun Microsystems. Archived from the original PDF on 28 February Retrieved 30 May Archived from the original PDF on 13 May Retrieved 3 November Sun Microsystems, Inc.

Retrieved 15 June Retrieved 6 February GNU Coding Standards. Baumann, M. Feliciano, F. In general, acidic deprotections deprotect less hindered silyl groups faster, with the steric bulk on silicon being more significant than the steric bulk on oxygen.

Fluoride-based deprotections deprotect electron-poor silyl groups faster than electron-rich silyl groups. There is some evidence that some silyl deprotections proceed via hypervalent silicon species.

The selective deprotection of silyl ethers has been extensively reviewed. A selective deprotection will likely be successful if there is a substantial difference in sterics e.

Unfortunately, some optimization is inevitably required and it is often necessary to run deprotections partway and recycle material.

From Wikipedia, the free encyclopedia. Protective Groups In Organic Synthesis. Tetrahedron Lett. Completion of the C and D rings.

Categories : Functional groups Protecting groups. Hidden categories: Use dmy dates from June Namespaces Article Talk. Views Read Edit View history.

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Namensräume Artikel Diskussion. Links hinzufügen. Bedeutende Vertreter sind neben der Trimethylsilyl-Gruppe die höher substituierten Silane Snooker Weltrangliste 2021 z. Hydroxygruppen in Alkoholen sind nukleophile funktionelle Gruppen und werden daher von Elektrophilen angegriffen oder in einer Eliminierungsreaktion entfernt.

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2 Gedanken zu “Otbs”

  1. Jetzt kann ich an der Diskussion nicht teilnehmen - es gibt keine freie Zeit. Ich werde frei sein - unbedingt werde ich die Meinung aussprechen.

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