Invalid json request (1)

I am new to infura and trying to get the response but getting error.
this is the piece of code im trying :
curl -X POST --data ‘{“jsonrpc”:“2.0”,“method”:“web3_clientVersion”,“params”:[],“id”:1}’

error : {“jsonrpc”:“2.0”,“error”:{“code”:-32600,“message”:“invalid json request”}}

Welcome to our community site, we are happy to have you here! Please take a look at the following curl command from our documentation. Make sure to replace the url with your own project URL. I’m just tested it and verified that this example works.

    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"web3_clientVersion","params": [],"id":1}'