The phrase "a single purpose of" is correct and usable in written English.
It can be used when specifying one particular aim or objective of something.
Example: "The committee was formed with a single purpose of improving community engagement."
Alternatives: "one goal of" or "a sole aim of".
I was impressed until the point where the foundation's representative explained that if a charity was registered with a single purpose of "advancing religion" it would be automatically excluded from applying for funds to deliver social welfare outcomes even when they were available to the whole community.
McKenzie's barrister, Ian Brownhill, who has previously represented a number of Occupy protesters, said it was "dangerous because, in terms of joint enterprise, if you are joined together in a single purpose – of course you are, in a large demonstration – and part of it turns disorderly, then they can try and hold you responsible".
The GM GSDD) concentration of NO2 representing a single purpose of having a fire in a household was 69.2 (2.7) μg/m3, any two purposes was 57.1 (2.9) μg/m3 and any three or more purposes was 55.6 (2.8) μg/m3.
Masafumi Asada bought shares of the Tokyo Electric Power Company almost a decade ago with a single purpose: To vote against the use of nuclear power.
But now a lot of shows at this end of the spectrum are built for a single purpose: to spend a maximum amount of a network's money.
"Patents are enshrined in the U.S. Constitution for a single purpose: to promote the progress of science and useful arts".
And therefore every word they utter that might conceivably go public must have a single purpose: to advance the national interests of the United States.
The author willfully ignores those events, persons or aspects of Russian life which would not prove conducive to his thesis, which is that the entire history of Russia has had but a single purpose: the creation of a police state.
The aim, Mr. Shoigu said, is to unite "all healthy political forces, and all of society, for the sake of a single purpose: Russia's prosperity".
Marie and Adrienne's 'lives' as revenants are reduced to a single purpose, each with only the memory of her suicide and her last emotions remaining.
Eight months ago, the Brexit vote seemed an unalloyed triumph for a party founded for the single purpose of campaigning for Britain's withdrawal from the European Union.
