Is it possible to write back the data into CRM from a custom grid on the MS Portal?

function test_ajax() {

    //debugger;
    var url2 = "adxportal1.crm4.dynamics.com/.../AccountSet"
    var account = {};
    account.Name = "Sample Account";
    var jsonAccount = window.JSON.stringify(account);
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        datatype: "json",
        url: url2,
        data: jsonAccount,
        beforeSend: function (XMLHttpRequest) {
            //Specifying this header ensures that the results will be returned as JSON.
            XMLHttpRequest.setRequestHeader("Accept", "application/json");
        },
        success: function (data, textStatus, XmlHttpRequest) {
            account = data.d;
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) {
            alert(errorThrown);
        }
    });
}