The Gunners went on a 22-minute rampage in the first half, scoring all their four goals against the Eagles within that period.
Manchester UnitedJose Mourinho says Manchester United are very close to wrapping up a deal for Arsenal forward Alexis Sanchez. Mkhitaryan should be the first to join, but the earliest he will play for the club is next weekend.More news: Smith for saying Damian Lillard needs to demand trade
The Arsenal manager hopes those deals, which follow the sale of Theo Walcott to Everton, will allow his players to focus on their performances rather than being distracted by the transfer sagas.
"We of course play the semi-final (of the League Cup) next week and after we have the Europa League as well, which is another target, so we have to very quickly get over this transfer period because for us especially this period has been more disturbing than ever", Wenger said. "That is why this transfer period in the middle of the season is hard". "That's hard so that's why I chose to leave him out". They are responsible for their own statements.
It was a chastening afternoon for Palace, who have lost only twice in their last 13 games - both defeats coming at the hands of Arsenal.More news: Toronto in running for new Amazon headquarters
Palace captain Luka Milivojevic pulled one back for the visitors in the 78th minute, chesting the ball down before turning and shooting into the corner past keeper Petr Cech.
"At half-time I thought we were staring down the barrel of a gun", he said.
Arsenal were in complete control and it showed with the superb move which led to them moving four goals ahead at the midway point of the first half.More news: Analyst Stock Recommendations For Pandora Media, Inc. (P), Tiffany & Co. (TIF)
Iwobi ended his three-month goal drought after getting on the score sheet against Palace.