The phrase 'request him to' is correct and usable in written English.
You can use it when you want to ask somebody politely to do something. For example, "I request him to come to the meeting at 9am tomorrow."
They merely request him to conduct an investigation.
We would then request him to let us meet his wife and repeat the conversation with her.
It's possible to request him to dive in the loch for fresh scallops to supplement the bounty, but we weren't so cruel.
Mr. Thompson has provided a letter to Parliament about what he knew of the Savile matter and has agreed to answer questions from Parliament if they request him to do so.
One of the questions that Ms Phillips wanted Mulcaire to answer was: "Did Ian Edmonson request him to investigate individuals connected with Max Clifford?" The Independent has seen a judgment made in October relating to a claim brought against News Group by Andy Gray, the Sky Sports commentator, another branch of Mr Murdoch's empire.
If I'm riding on the highway and I come to a village in which a smith lives, who has sufficient stuff to shoe my horse, if my horse has lost a shoe and I request him to shoe him at proper time, and I offer him sufficient for his labor, and he refuses, and if my horse is lost for want of shoes, and by his default, I say that in that event, I will have trespass on the case.
I identified myself and requested him to pull over to the curb.
Minos too turned to Daedalus, requesting him to build a Labyrinth, from which the Minotaur could not escape.
In 1992, President George H. W. Bush, who liked to build alliances before invading, sent federal troops to quell the Los Angeles riots after the governor requested him to.
Missouri was a slave state, and in 1835 a letter signed by a number of important men in St . Louisrequested him to moderate the tone of his editorials.
Denis Diderot wrote of her in his Rêve de d'Alembert (written 1769, published 1830; D'Alembert's Dream), which she requested him to suppress.
