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
Substituents that increase the negative character of the ring (EDG) increase the rate of the EAS reaction. Substituents that decrease the negative character (or increase the positive character, EWG) of the ring decrease the rate of the reaction.