Step 6: Scroll down and select the Spanish option. Then, to type with the Spanish keyboard, you can touch the globe icon to the left of the space bar, as described above. Typing on an iPad keyboard is easier than on an iPhone, and you can add keyboards in different languages on iPads as well.
The Wittig reaction or Wittig olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide (often called a Wittig reagent) to give an alkene and triphenylphosphine oxide.he steric bulk of the ylide 1 influences the stereochemical outcome of nucleophilic addition to give a predominance of the betaine 3 (c.f. BuergiâBÃ¼rgi dunitz). Angle note that for betaine 3 Both r 1 And r 2 as well PPh3+ pph3 Andâ o are positioned anti to one. another
If R'' is Ph or R is an electron withdrawing group, then the ylide is stabilized and is not as reactive as when R'' and R are alkyl. Stabilized ylides give (E)-alkenes whereas non-stabilized ylides lead to (Z)-alkenes (see also Wittig-Horner Reaction).