The phrase "rejections of" is correct and usable in written English
You can use it to describe when something is rejected or not accepted. For example: "The rejections of his application were especially painful for him."
Due to the high number of rejections of the randomization protocol, we analyzed the differences between accepted and rejected patients.
There were attempts and rejections of certification letters, too".
"But despite rejections of it by many people and some religious scholars, it continues".
It's true that some rejections of disco were simply sublimations of racism and homophobia.
When he was 30, Saturday Night and Sunday Morning was published (after several rejections, of course).
The suspicions refuse to go away despite official rejections of continued doping.
On Monday morning, Norquist tried, once again downplayed the G.O.P. rejections of his pledge.
They continued to press complaints about unjustified rejections of overseas absentee ballots that favored Mr. Bush.
Iran's state-run media was dominated on Thursday by rejections of the American charges.
Two decisions he later regretted were his rejections of Frantz Fanon's "Wretched of the Earth" and Vladimir Nabokov's "Lolita".
Wallace's attacks on Washington's "pointy-headed bureaucrats" were easily read as rejections of the civil rights laws.
